a friend who has smashed with the same wizard sleeve as you.
did you fuck sara too? man, you're my tunnel buddy now.
When guys have slept with the same girl on different occasions.
Are you serious, you slept with Sara too. You know that makes you and Frankie Tunnel Buddies!
When two male individuals have sex with the a female within a short period of time. This word became popular in the Howard Stern Show
Having sex with these chicks last night made us official Tunnel Buddies
slang - Homosexual man (i.e. the catcher)
That over there is walking like he's got something up his ass, he's got to be a tunnelbuddy