B737-300 FLT CREW ABORTS TKOF DUE TO TKOF WARNING HORN CAUSED BY FAILURE TO LOWER THE FLAPS.

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WE ABORTED TKOF AT LOW SPD DUE TO A TKOF WARNING HORN. WE CLRED THE RWY AND THEN NOTICED THE FLAPS WERE STILL IN THE UP POS. APPARENTLY; I HAD FAILED TO DROP THE FLAPS AND THEY WERE NOT CHKED BY THE CAPT AS PER THE CHKLIST; TO BE IN POS DURING THE BEFORE TKOF CHKLIST. THERE ARE 3 FACTORS THAT CONTRIBUTED TO THIS EVENT: 1) AS WE BEGAN TO MOVE UNDER OUR OWN PWR AND AS PER COMPANY SOP; I WAS TO DROP THE FLAPS INTO DESIRED TKOF POS; AT WHICH POINT THE CAPT SAID 'WAIT A MIN; WE DON'T HAVE ENOUGH OIL PRESSURE' AND SHE QUICKLY CLOSED THE THROTTLES. MY REACTION TO THIS ACTION BY THE CAPT WAS TO TAKE MY HANDS OFF THE FLAP LEVER LEAVING THE FLAPS POSITIONED UP. AFTER A BRIEF DISCUSSION ABOUT UNREGULATED OIL PRESSURE AND THE FACT THAT IT VARIES WITH N2; WE RESUMED THE TAXI OUT. 2) AS I READ THE BEFORE TKOF CHKLIST; THE GLARE FROM THE SUN MADE THE FLAP INDICATOR AND LEADING EDGE FLAPS EXTINGUISH LIGHT DIFFICULT TO SEE. 3) I BELIEVE FATIGUE MAY HAVE CONTRIBUTED TO MY PERFORMANCE; DUE TO THE FACT THAT I HAD FLOWN 93 HRS IN THE LAST 30 DAYS. IN ORDER TO PREVENT THIS SIT FROM RECURRING; I BELIEVE IF IT WERE NOT SOP TO WAIT UNTIL WE TAXI UNDER OUR OWN PWR BEFORE DROPPING THE FLAPS; THIS NEVER WOULD HAVE HAPPENED. IF POSITIONING THE FLAPS WERE PART OF THE INITIAL FLOW AFTER THE SALUTE AND RELEASE FROM GUIDANCE; AGAIN; THIS WOULD NOT HAVE OCCURRED. ALSO; I RECOMMEND A CHANGE IN THE BEFORE TKOF CHKLIST AS FOLLOWS: THE CHALLENGES OF 'FLAPS' SHOULD HAVE A RESPONSE BY BOTH CAPT AND FO. SUPPLEMENTAL INFO FROM ACN 606787: WE RAN THE BEFORE TKOF CHKLIST BUT; FOR SOME REASON; MISSED THE FLAPS. THE COPLT AND I DISCUSSED THE INCIDENT. ONE REASON MAY BE THAT HE IS AN 'FFDO' AND WAS PUTTING ON HIS WEAPON AFTER PUSHBACK AND WE GOT DISTR. HE EITHER DIDN'T READ THE ITEM ON THE CHKLIST OR I MISSED IT OR BOTH.