AN ACR CAPT INADVERTENTLY TAXIED INTO THE APCH AREA FOR RWY 27L; TWICE; WHICH RESULTED IN EVASIVE ACTION GAR DURING 2 SEPARATE INCIDENTS. THE CAPT RPTS THAT THE FLT HAD DEPARTED THE GATE LATE; AND THEN WAS GIVEN AN AMENDED IMMEDIATE CLRNC CAUSING THE RPTR TO 'RUSH' FOR THE RWY.

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TAXI CLRNC WAS TO RWY 22L VIA TXWYS B AND D. APCHING RWY 27L PAD; TWR TOLD US WE COULD CUT DIAGONALLY ACROSS THE RWY 27L PAD AND 'CAN YOU ACCEPT AN IMMEDIATE TKOF ON RWY 22L?' WE ACCEPTED AND WERE CLRED FOR TKOF; WITH AN ACFT ON A 1 1/2 MI FINAL. UNFORTUNATELY; AS I CUT ACROSS THE RWY 27L PAD; INSTEAD OF SQUARING OFF THE TURN; I HEADED FOR THE RWY 22L Q INTXN; INSTEAD OF FULL LENGTH FROM TXWY D. THE FO AND TWR CAUGHT THE ERROR AT THE SAME TIME; BUT I WAS TOO FAR ONTO TXWY Q TO ENABLE A TURN BACK INTO THE RWY 27L PAD. BECAUSE I HAD ENCROACHED INTO THE CLRWAY FOR RWY 27L; TWR TOLD THE ACFT ON FINAL TO GAR; AND THEN TOLD US TO TAXI ONTO RWY 22L AND 'EXIT DOWNFIELD.' THE 'DOWNFIELD' PART DIDN'T REGISTER IN MY MIND; AND I TURNED L ONTO THE RWY; INSTEAD OF R; TO CLR THE RWY IN THE MOST EXPEDITIOUS MANNER AT TXWY D. THIS KEPT ME IN THE CLRWAY FOR RWY 27L; AND CAUSED ANOTHER ACFT TO GAR (NOT A GOOD DAY!). FACTORS: WE LEFT THE GATE 26 MINS LATE DUE TO A GATE CHANGE AND LATE PAX; AND I WAS PROBABLY SUBCONSCIOUSLY HURRYING. I ACCEPTED AN IMMEDIATE TKOF CLRNC WHEN I WAS STILL OVER 1000 FT FROM THE HOLD SHORT; CAUSING ME TO RUSH FOR THE RWY. AFTER THE ERROR WAS COMMITTED; IT SEEMED LOGICAL TO BACK TAXI AND EXIT THE RWY IN THE MOST EXPEDITIOUS MANNER; RATHER THAN TAXI DOWN THE RWY 1800 FT TO TAKE A REVERSE HIGHSPD; SO I APPARENTLY HEARD WHAT I EXPECTED TO HEAR; NOT WHAT WAS ACTUALLY SAID.