B767 FLC ARE UNSURE OF CLRNC AND QUESTION LAX GND CTL'S PHRASEOLOGY AS ANOTHER ACFT IS ISSUED A GAR.

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CAPT LESS THAN 1 YR IN TYPE; FO 2 YRS IN TYPE. CAPT SAID HE HADN'T BEEN TO LAX IN APPROX 10 YRS. FO HAD BEEN FLYING TRIP ALL MONTH. ENG START UNEVENTFUL. TAXI INSTRUCTIONS WERE TO TAXI TO RWY 25R VIA TXWY B FROM RAMP. TAXI UP TO TXWY F WAS UNEVENTFUL. DURING TAXI; FO SWITCHED TO TWR FREQ 120.95; AS PER TXWY SIGN INSTRUCTIONS. (NOTE; AT LAX; DURING TAXI TO RWY 25L IT IS UNDERSTOOD THAT ALL ACFT WILL HOLD SHORT OF TXWY F UNTIL TOLD OTHERWISE BY TWR CTLR.) THERE IS A TXWY SIGN STATING THIS JUST PRIOR TO THE INTXN OF TXWYS B AND F. APCHING TXWY F; TWR CTLR CLRED ACFT TO 'TAXI FULL LENGTH; RWY 25R.' I REPEATED BACK THE CLRNC AS READ. AS I HAD BEEN FLYING THIS TRIP ALL MONTH; I WAS FAMILIAR WITH THIS TERMINOLOGY. DURING THE TIME BTWN TXWY F AND THE END OF TXWY B; I WAS HEADS DOWN FINISHING UP THE BEFORE TKOF CHKLIST. APCHING THE HOLD SHORT LINE FOR RWY 25R; I GLANCED UP AND SAW WE WERE TAXIING LIKE WE WERE NOT GOING TO HOLD SHORT OF THE HOLD SHORT LINE. IN A SHORT PERIOD OF TIME; 1 OR 2 SECONDS; I TRIED TO RECALL THE TWR CTLR'S CLRNC. I CAME TO THE CONCLUSION THAT WE PROBABLY HADN'T BEEN CLRED POS AND HOLD ON RWY 25R. MY NEXT DECISION WAS TO ASK THE CAPT; 'ARE WE CLRED POS AND HOLD;' HE DELAYED A SECOND AND SAID; 'I THOUGHT SO.' HE THEN ABRUPTLY APPLIED WHEEL BRAKES AND CAME TO AN IMMEDIATELY STOP. UNFORTUNATELY; WE HAD PASSED THE HOLD SHORT LINE FOR RWY 25R; BY A FEW FEET. WE WERE DEFINITELY SHORT OF THE RWY. I THEN PROCEEDED TO CALL THE TWR CTLR AND QUERY HIM AS TO WHETHER WE WERE CLRED POS AND HOLD ON RWY 25R. I DON'T RECALL HIS REPLY; BUT IT DEFINITELY WAS A NEGATIVE ONE. SOMETHING TO THE EFFECT; 'YEAH; I SAW YOU DOWN THERE AND WONDERED WHAT YOU WERE DOING...' THERE WAS ANOTHER ACFT CLRED TO LAND ON RWY 25R AND THE TWR CTLR SENT THE ACFT AROUND. HE SEEMED TO BE ABOUT 2 OR 3 MI OUT. AFTER ACFT WENT AROUND; WE WERE SITTING ON THE TXWY; WONDERING WHAT TO DO. WE QUERIED THE CTLR FOR INSTRUCTIONS AND GOT NONE. I DO NOT RECALL HIS EVENTUAL REPLY; BUT IT WAS SOMETHING TO THE EFFECT THAT 'WE WERE CLRED FOR TKOF RWY 25R.' THE REMAINDER OF THE FLT WAS UNEVENTFUL. RECOMMENDATIONS: SINCE THE CAPT HADN'T BEEN TO LAX IN QUITE A WHILE; I SHOULD HAVE THOROUGHLY BRIEFED HIM ON THE RWY 25R PROC. COMING INTO LAX; I HAD BRIEFED HIM ON WHAT I THOUGHT WERE DIFFERENT PROCS FOR LAX; BUT I DIDN'T REMEMBER TO BRIEF HIM ON THE TAXI OUT. AS ALWAYS; LISTEN UP ON THE FREQ AND REPEAT BACK ALL INSTRUCTIONS NOT ONLY TO THE CTLR; BUT ALSO TO THE OTHER FLT DECK CREWMEMBERS. AFTER THINKING ABOUT THE CLRNC; I TRIED TO COME UP WITH A BETTER VERBAL CLRNC FROM THE TWR CTLR. THE CAPT HAD TOLD ME HE THOUGHT THE CLRNC WAS; 'TAXI FULL LENGTH; POS AND HOLD RWY 25R;' MAYBE A BETTER ONE FOR HOLDING SHORT WOULD BE; 'TAXI FULL LENGTH; HOLD SHORT RWY 25R.' THIS WOULD BE INSTEAD OF 'TAXI FULL LENGTH RWY 25R;' WITH THE IMPLIED HOLD SHORT OF RWY 25R. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE ACTUAL PHRASEOLOGY FOR THIS OP IS -- TAXI FULL LENGTH; HOLD SHORT OF RWY 25R; AS PROVIDED BY A TWR SPECIALIST.