tunnel surfer
Slang term for a man's penis. The "tunnel" refers to a woman's vagina. Generally used to refer to someone's penis in mixed company.
Guy: Dude, I was with this girl last night, and she wanted my pe-
{mom walks by}
Guy: tunnel surfer so bad.
Mom: Must be a new toy.
{mom walks by}
Guy: tunnel surfer so bad.
Mom: Must be a new toy.