a word in Huston Street's dictionary: to lack the ability to fail
"If you're staring straight ahead like you're undefeatable, then you're a Longhorn."
by the54effect July 10, 2008
2 more definitions
Top Definition
Unable to be defeated; Able to be undefeated; Pre-requisite to being undefeated
Man #1 - "Hey man, did you see GSP fight last night?"

Man #2 - "Yeah dude, that guy is undefeatable right now!"
by Captain Seagrams March 28, 2010
not able to lose at beer pong
Andrea and Sarah are undefeatable at beer pong!!
by Andrea H November 26, 2005

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