pigskin bus
Another name for a penis
Yo, me an' my old lady got together last night I took the pigskin bus to tunatown.
Parking the pigskin bus in tuna town
A quaint euphemism for heterosexual sexual intercourse.
Police officer: What are you doing in the back of that car sonny?
You: Parking the pigskin bus in tuna town, sir.
You: Parking the pigskin bus in tuna town, sir.