To over-estimate your realistic prowess with the opposite sex. Also known as a disparaging alternative to a Peter Pan personality.
1. "Man, did you see that chick I was tuning?"
"Aw, Coops... you're such a Tuckfuck."

2. "GT is in the house, ladies, show me some ass!!"
"Someone has a bad case of Tuckfuck."
by Cheegro January 4, 2009
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to tuck your dick behind your thighs & proceed to humping your thighs until ejaculation. hence:
"tuckfuck"
Joey: man i'm so fucking horny i'm tuckfucking right now.

Bo:oh me too.
by drety January 25, 2009
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