the concept of rationing something such that it lasts longer. often misused as "tie over" or "tie up".
if one wants to be bound, gagged and fucked in the ass, one would say "tie me up"
if one wants to ration the semen on their face such that they can enjoy the taste longer, one would say, "this cum will have to tide me over until i can get him off again"
To delay a desire for something until a greater amount of the desired object can be acquired later.
Tide over: This sandwich will have to tide me over till dinner time.