look up any word, like dirty sanchez:
 
1.
People that just talk out there ass and make retarded people look smart.
That dude didn't have a clue what he was talking about, what a MacGruder.
by DB4life July 08, 2011
 
2.
An inbred pole smoker too stupid to understand his own defeat.
Anti gravity has existed since the 60s?! What a MacGruder!
by TheRevLOLOL July 15, 2011