Top Definition
Someone who is so indescribably unattractive that it is impossible to fuck them.
"I've thought about it dude, but she isn't just ugly, she's mean. Totally uneffable."
by Matty B Good May 19, 2009
1 more definition
short for un-effing-believable; un-fucking-believable; unbelievable
"That concert was uneffable!" -Roger
by MissJuly October 15, 2013

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