a guy's tasty dick when he gets oral sex without having washed 'recently': his partner is having a 'salty sam' on account of the salty sweat and other residues that are ingested in the process of the fellatio

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