Top Definition
1) to masterbate quickly to relise built up pressure of the gunk sack.

2) to pleasure yourself over a smutty mag/film/thought/smell/idea/10 minute freeview on adult channel/trevor mcdonald/small animals/clothes pegs/the girl who gets changed by the window at number 34.

..do much week end brett...? na buh, spent the mornin thrappin like a gud un then ate some marmalade..
by hairy berry September 11, 2006
9 Words related to thrappin

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