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To sacrafice yourself by feigning interest in the hot girl's/guy's fat/ugly/annoying friend. Generally done while going out with a group of people, as it would be senseless to fall on the grenade solo.

see also fall on the grenade, jump on the grenade, sit on the grenade.
Rupert: Thanks for taking the grenade last night, man. It was totally sweet hooking up with that really hot girl. How was hooking up with her ugly friend?"

Cornelius: Not so bad once I got the brown paper bag over her head.
by cosmo October 08, 2004
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