Top Definition
A best friend that is acting strange and seems to be hiding something from you.
Duder 1: "So, dude I'm moving in with my girlfriend in a couple months. I couldn't hang out on Saturday because we were looking at apartments."

Duder 2: "You son of a bitch! I knew something was going on. You were totally acting like a shady bff."

Duder 1: "Ha ha yeah dude sorry. I was going to tell you, I just didn't want you to get mad!"
by westfalia January 26, 2010
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