PLT OF C172 CROSSED RWY WITHOUT A CLRNC AT PDK DUE TO AMBIGUOUS CLRNCS FROM GND CTLR.

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MY INITIAL POS WAS ON THE PARKING RAMP IN FRONT OF THE CTL TWR JUST OFF TXWY B. I MONITORED ATIS AND WAS AWARE THAT THE ACTIVES WERE RWY 2R AND RWY 34. I CONTACTED PDK GND AND REQUESTED TO TAXI TO THE N RAMP. I WAS GIVEN CLRNC TO CROSS RWY 34 AND PROCEEDED TO THE N RAMP WITHOUT INCIDENT. I PICKED UP A PAX AT THE N RAMP; CONTACTED PDK GND CTL AND STATED I NEEDED A VFR NE DEP. PDK GND ISSUED 'TAXI TO RWY 34; HOLD SHORT AT TXWY H; HOLD SHORT OF RWY 24.' I PROCEEDED TO TAXI VIA TXWY D WITH THE UNDERSTANDING OF HOLDING SHORT OF RWY 34 AT TXWY H. PDK GND ORDERED ME TO STOP; STATING THAT I DID NOT HAVE CLRNC TO CROSS RWY 34. I STATED THAT I WAS HOLDING SHORT 'OF' RWY 34 'AT' TXWY H. PDK GND STATED THAT I WAS INSTRUCTED TO HOLD SHORT 'OF' TXWY H AND ORDERED ME TO TURN AROUND AND MAKE A L TURN AND HOLD SHORT 'OF' TXWY H. A JET WAS APCHING FROM MY L ON TXWY A. THE JET WAS CLRED TO CROSS RWY 34. PDK GND GAVE ME DIRECTIONS TO CONTINUE MY TAXI. NO FURTHER ROUTING OR INSTRUCTIONS WERE GIVEN. I STATED 'XXX TO CROSS RWY 34 AT TXWY H; AND HOLD SHORT OF RWY 24.' PDK GND DID NOT CHALLENGE MY ROUTING. I TAXIED ACROSS RWY 34 AT TXWY H. AFTER XING RWY 34; PDK GND QUESTIONED ABOUT MY POS. I CONFIRMED MY POS AND WAS TOLD I WAS NEVER AUTH TO CROSS RWY 34 AND TO CONTACT TWR WHEN I RETURNED. I WAS LATER TOLD TO TAXI TO THE RAMP AND MEET A TWR SUPVR. I MET WITH THE SUPVR. HE STATED THAT HE WOULD REVIEW THE TAPES AND CONTACT ME IF I WAS UNDER ANY ACTION. HE DID NOT CALL ME; SO I CALLED HIM THE NEXT DAY. HE STATED THAT I HAD REPEATED THE CLRNCS CORRECTLY BUT WAS NOT CLRED TO CROSS RWY 34. HE SAID THAT I DID STATE MY INTENTIONS OF XING. SINCE THE PDK GND CTLR DID NOT CHALLENGE THE ROUTING; THERE WAS NO FURTHER ACTION NEEDED FROM ME. CONTRIBUTING FACTORS: GND USED THE WORDS HOLD SHORT 'AT' INSTEAD OF USING HOLD SHORT 'OF.' TO ME; THIS IMPLIED THAT THE CTLR WANTED FOR ME TO RETURN THE SAME DIRECTION I WAS JUST RECENTLY CLRED. IT WAS VERY BUSY; THERE WAS A LOT OF LIGHT AND MEDIUM SIZE ACFT TFC USING THE 2 ACTIVE RWYS AND TXWYS; AND THE GND CTLR WAS VERY BUSY PROVIDING CLRNCS. I AM SURE THE HVY VOLUME OF TFC PLAYED A ROLE. THE CTLR DID NOT RESPOND TO MY ROUTING READBACK; POSSIBLY DUE TO THE VOLUME HE WAS CTLING. REMEDIAL ACTIONS: I HAVE REVIEWED THE AIM SECTIONS; SPECIFICALLY 'TAXIING;' AND 'TAXI CLRNC.' I HAVE COMPLETED THE AOPA AIR SAFETY FOUNDATION RWY SAFETY PROGRAM AND CONSULTED 2 CFI'S FOR UNDERSTANDING OF TAXI CLRNCS.