When you are heavily sleep deprived and extremely horny but can't seem to find any porn and just end up watching youtube videos until end up in a state known as meme horny and wake up in parallel universe known as pornhub

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