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1.
To be betrayed, backstabbed, dissed, or punked by a someone you thought loyal.
Usually it's bros before hos, but Eddy torpedoed me with that bitch.
by mcgggggg May 31, 2005
 
2.
The accidental insertion of the erect Penis into a Woman's anus during regular vaginal intercourse. This is unplanned entry without pre lube or forewarning. Often ends in a slap in the face or surprise orgasm. Usually pain
I was banging that bird and I totally torpedoed her, turns out she had piles and didn't like it up the shitter
by Torpedoed August 31, 2014
 
3.
1. To discourage a girl from giving some action to a male friend

Being torpedoed is similar to being cockblocked, but the culprit is another male friend who is also interested in the same girl. Usually the girl is less interested in that other friend; therefore, he tries to ruin his friend’s chances too.
WTF? Ken just torpedoed Keith's chances with Trinity. That was just a damn mean thing to do!
by Hardin Long April 14, 2004