Usually used by freshman in highschool to annoy the upper class men. The actual meaning of soump is, "Look who's talking" and is generally a comeback to an insult.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

A word used mainly by faggots. It means absolutely nothing and is often used in rebuttal to an insult, because the user is too retarded to think of anything else.

Look who's talking.