A female who is a secret lesbian. She may date, shack up with, and/or flirt with guys but deep down she has a strong passion for females. She is still in the closet or in this case the "lunchbox" She thinks your mom packs better stuff and wants a peek inside and possibly a taste.

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