To Smallfry is to go about having sex with someone but come away from the experience not knowing if you did or did not have sex.
The word is normally used when unsuspecting virgins try to "pop their cherry" but don't know if they did or didn't do it.
Steve: I finally got with Sarah last night but I think I did a Smallfry!
Steve's mates: Did you hear about Steve last night??? He finally got with Sarah but was totally Smallfried!
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