I'm a Sandwich
Saying that you're a sandwich is the equivalent to saying that you're a submissive in a BDSM relationship. It can also mean that you have to desire to he in the previously mentioned relationship in which you are the submissive
Jonah: I'm a sandwich
Oliver: What does that mean?
Jonah: It means I want my girlfriend to peg me
Oliver: What does that mean?
Jonah: It means I want my girlfriend to peg me
I'm Your Tuna Fish Sandwich
From the blues classic - slang for sexual availability.
"Free tonight?"
"I'm your tuna fish sandwich."
"Free tonight?"
"I'm your tuna fish sandwich."
"I'm your tuna fish sandwich, spoon me on your bread.
I'm your tuna sandwich baby, best to eat in bed."
I'm your tuna sandwich baby, best to eat in bed."