A B737-800 CREW; TAXIING FOR TKOF AT EWR; RESPONDED TO A TAXI INTO POS AND HOLD CLRNC THAT THE TWR STATED THEY NEVER ISSUED.

Narrative

WE WERE HOLDING SHORT OF RWY 22R ON TXWY W; WAITING FOR A B767 TO TAKE OFF. AFTER THE B767W WAS CLRED TO TAKE OFF; WE HEARD 'RWY 22R AT TXWY POS AND HOLD; CAUTION WAKE TURB BEHIND DEPARTING B767.' I READ BACK 'POS AND HOLD RWY 22R AT W.' I INITIATED THE BEFORE TKOF CHKLIST AS THE CAPT MOVED THE ACFT INTO POS ON RWY 22R AT TXWY W. AS WE TURNED TO THE LINE-UP POS; THE CAPT MENTIONED SEEING SOME LIGHTS TURNING ON OVER HIS L SHOULDER; BUT WE HAD TURNED TOO FAR TO BE ABLE TO SEE ANYTHING BEHIND US. I HEARD THE CTL TWR WORKING ACFT FOR LNDG ON RWY 22L AND ONE IN THE VISUAL PATTERN FOR RWY 22R; BUT THERE WERE NOT ANY MORE CALLS TO THE ACFT ON THE GND. WE SAT FOR ABOUT 1 MIN IN POS WHEN THE TWR TOLD US TO CLR THE RWY. THE TWR CTLR THEN STATED THAT WE HAD NOT BEEN AUTH TO BE ON IT. AS WE WERE TAXIING CLR OF THE RWY; THE TWR CTLR TOLD A HAWKER JET TO ALSO CLR THE RWY. THE HAWKER JET HAD BEEN HOLDING IN POS ON RWY 22R BUT FROM THE FULL LENGTH POS. THE ACFT FROM THE VISUAL PATTERN LANDED. AFTER A FEW MINS WE WERE CLRED BACK ONTO THE RWY AND TOOK OFF WITHOUT INCIDENT.