EMB135 FLT CREW HAS TKOF CLRNC CANCELED FROM THE TWR AT LGA.

Narrative

WHILE TAXIING TO RWY 4 FOR TKOF; WE RECEIVED CLRNC TO TAKE OFF. VERY SHORTLY AFTER BEGINNING A ROLLING TKOF; WE HEARD A RADIO XMISSION ON TWR FREQ THAT SOUNDED LIKE 'CANCEL; GUYS.' THIS WAS FOLLOWED VERY SHORTLY BY ANOTHER XMISSION THAT SOUNDED LIKE 'CANCEL.' WE THEN HEARD A THIRD XMISSION THAT CLRLY SOUNDED LIKE 'DID YOU GET YOUR CLRNC?' I DECIDED TO ABORT THE TKOF; AND WE BEGAN THE ABORT AT ABOUT 50 KTS. THE ABORT WAS DONE SMOOTHLY WITHOUT EXTREMELY HARD BRAKING. AFTER A SHORT DELAY ON THE RWY TO GET TWR GUIDANCE; WE TAXIED CLR OF THE RWY TO THE L AT TXWY Y. WE THEN BEGAN A SHORT TAXI BACK TO THE RWY FOR TKOF. WITHOUT ANY HOT BRAKES OR OTHER MECHANICAL DISCREPANCY; WE CONCLUDED THAT IT WAS SAFE TO PROCEED ON TO PIT. AT PIT; I TELEPHONED LGA TWR. THEY EXPLAINED THAT THEY MADE SEVERAL CALLS USING NORMAL TERMINOLOGY; SUCH AS 'CANCEL TKOF CLRNC;' BUT THAT THESE XMISSIONS MUST HAVE BEEN STEPPED ON BY OTHER RADIO TFC. THEY HAD ALSO SENT AROUND LNDG TFC (RWY 31) BECAUSE THEY COULDN'T CONFIRM THAT WE WERE ABORTING OUR TKOF.