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2.
A hipster who tries so hard to be hip that they act derpy all the time.
That guy wears plaid shirts with purple pants. What a derpster!
by DeflatedballoonLOLOLOL November 14, 2011
 
1.
One who derps. DERP!!!!
1. Tom: "Dude, Gary is totally hitting on his girlfriends mom right in front of her!"

John: "What a friggin' derpster!"

2. "Bernie just screwed me on my car loan. I'll get that derpster if it's the last thing I do!"
by JoBry August 23, 2007