a boomer trying to learn memes to talk to his grandson about something he cares about

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

noun. female breasts, but referring especially to the larger sized mammary glands. not specific to firmness or nipple size, although with incline toward large cleavage visibility.