Sandwich

Sticking your cock between a pair of ass cheeks. The cheeks being the buns and your dick being the meat.

Yeah I just sandwiched my girlfriend last night

rusty smith

A single rusty iron anal bead that has rusted over multiple uses.
Or
An anal bead that is left inside your asshole so long that it rusted from being in there.

I'm sorry Sir but I don't have a Rusty Smith in my system.