TXWY INCURSION WHEN THE PIC OF A TAXIING GULFSTREAM CONTINUES A TAXI FOR ABOUT 400 FT AFTER CLRING THE RWY AT TEB; NJ.

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WE LANDED ON RWY 19 AT TEB AND AS I WAS DECELERATING THE ACFT; WE RECEIVED OUR RWY CLRNC INSTRUCTIONS FROM TWR. I UNDERSTOOD VIA THE PNF THAT WE WERE TO TAXI ON TXWY K; THEN R ON TXWY L FOR FBO AND CONTACT GND. MY WORKLOAD WAS FAIRLY HIGH AS I WAS STOPPING THE ACFT AS THE INSTRUCTIONS CAME IN FROM TWR. WE CLRED AT TXWY K AND MADE A R ON TXWY L AND BEGAN A VERY SLOW TAXI FORWARD TO OPEN THE AREA FOR OTHER ACFT BEHIND US TO CLR. THE GND FREQ WAS VERY BUSY; ALTHOUGH THERE WERE NO OTHER ACFT OR VEHICLES MOVING ANYWHERE NEAR OUR AREA. I WAS PROMPTING THE PNF TO GET WITH GND REPEATEDLY AS WE WERE VERY LATE. HE HAD ME UNDERSTAND WE COULD TAXI ON TXWY L; BUT AT NO TIME WAS I GOING TO PASS ANY INTXN OR CROSS ANY RWY UNTIL WE WERE IN CONTACT WITH GND. UPON MAKING CONTACT WITH GND; THE CTLR YELLED INTO HIS MIKE; 'WHY ARE YOU TAXIING WITHOUT A CLRNC?' WHICH HE REPEATED TWICE. THE PNF REPLIED; 'WE ARE STOPPING' AS I BROUGHT THE ACFT TO A COMPLETE HALT; APPROX 300-500 FT FROM INTXN K WHEN WE CLRED THE RWY. I XMITTED TO GND THAT WE WERE GIVEN TXWY L AND GOT NO REPLY. HE KEPT US STOPPED FOR ABOUT 1-2 MINS BEFORE CLRING US TO FBO X AND ASKED IN THE FUTURE TO MAKE SURE WE HAVE CLRNC PRIOR TO TAXI. HIS SCREAMING AT US ON THE RADIO SHOOK MY NERVES AND AFFECTED MY PERFORMANCE AND ATTITUDE FOR THE REMAINDER OF THE FLT THAT DAY. FOLLOWING OUR REPRIMAND; HE WAS POLITE; COURTEOUS AND HELPFUL WITH OUR OPS AT TEB AND UPON SWITCH-OVER TO TWR FOR OUR TKOF; WISHED US A PLEASANT FLT. PERHAPS THE TWR CTLR INFORMED HIM OF OUR CLRNC ONTO TXWY L. IN THE FUTURE; I WILL NOT BUDGE FROM POS UNTIL WITH GND FREQ FOR VERIFIED CLRNC. AS THERE WEE MANY ACFT BEHIND US LNDG; I WAS TRYING TO FACILITATE MAX RWY AVAILABILITY FOR THOSE AFT TO LAND AND CLR. I WAS NOT INTENDING TAXIING WITHOUT FURTHER CLRNC FROM GND. I ALSO NEED TO ENSURE IN THE FUTURE THAT OUR COM IN THE COCKPIT IS CLR REGARDING CLRNCS AND INSTRUCTIONS. ALSO; I THINK THAT TAXI INSTRUCTIONS SHOULD BE GIVEN TO ACFT DURING A LOWER WORKLOAD PERIOD AFTER THE ACFT IS SLOWED AND IS CLRING AT THE FIRST AVAILABLE TURNOFF AS PER THE AIM; RATHER THAN DURING THE ROLLOUT; BECAUSE BOTH PLTS ARE NOT FOCUSED ON THE INSTRUCTIONS; AS ONE IS SLOWING THE AIRPLANE.