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To do some bangin.. like rogerring your lady friend... slipping your todger up her... rat up a drainpipe etc. Fompen is the verb of "fomp".
Man: Hey Lady,
Lady: Yeah?
Man: Im in the mood for some fompen
Lady: Let's fomp!

Man: I wanna fomp you in the butt
Lady: Im in the mood for fompen too!
by emmarhoids February 10, 2011