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1 definition by Dieselboi

 
1.
(1) (Noun) The act of not fully inserting one's penis in an other's vagina or anus until about to cum and then just before one is going to cum, the full erection is thrust into the vagina or anus. (2) (Verb) To not fully insert one's penis in an other's vagina or anus until about to cum and then just before going to cum, the full erection is thrust into the vagina or anus.
The girl thought he was fully inside her while having sex until he gave her a cock up.
by Dieselboi February 02, 2010