1) The sound of a Brain-fart, usually when a fairly smart person says something that's rather silly by accident or the wrong word or can't think of what to say.

2) Breaking something or crashing into something due to thinking too much.

3) Being silly and not caring what other people think of you. See dork
"It'd work better if you used contrasting colors. No, not contrasting -- Contrasting. Not contrasting! You should use contrast-gah! Do you know what I'm trying to say?"
"Complimentary?"
"Derp! YES! THANK YOU!"

"Did you hear the professor walked into a wall today while working on his latest thesis?"
"Ha! No I didn't. He's such a derp"
by mindthederpface March 28, 2013

The Urban Dictionary Mug

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1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug