Top Definition
An enormous erection provoked by the sound of a Diesel engine. Usually reaching its peak upon hearing the compressor surge. Pointing slightly to the left is a key sign to look for.
It was inevitable that Tyler would end up with a diesel boner while at work after hearing the big Ford leave the parking lot.
by Mr. Antler January 17, 2013

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A huge erection, usually caused by an extremely hot chick.
So we were messing around and Jenny took her bra off. Her tits were so nice that my diesel boner popped out of my draws and between her sweater puppets.
by GTPanic33 March 09, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

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

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt