Top definition
1.) A word used when you have nothing better to say.

2.) A word used when you don't know the answer to the question that just got asked to you.

3.) A word used just to throw people off
1.) Person 1:"So how was your day?"

Person 2: "derpflerp."

2.) Person 1: "What was the math homework last night?"

Person 2 "Derpflerp."

Person 1: o.O

3.) *dead silence*

"Derpflerp!"

People around you: O.o "wtf"
by thatcoolkiddo6 June 23, 2011
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