The definition of a Fuckdude is somebody that is always screwing things up for you or a group of friends.
Person A: Hey man, do you have the tickets?
Person B: Oh no! I forgot them at the house!
Person A: Fuckdude!
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A girl who is hot, flirty, lively and sexy when clothed, but once you get her in bed, she's like a warm ham with a pulse.
That girl Shawonka sure has the curves and knows she's a fine piece of ass, but bro - what a fuckdud. It was like an extra pink corpse in my bed.