Top Definition
A female's plan B.
He is never a an alpha male, as an alpha male will be automatically given the place of boyfriend once met.
A guy with an ego (or worthy of it) never fills this role. I mean, he can't claim what he's hitting so what's the point?

The emergency option just incase the man of her dream's doesn't marry her, or leaves her for someone else.
A mere safety net.
Hashtag ride-it-and-deny-it.

Thee go-to guy. A "boo when I feel like it". A necessary tool to be used. You ride him reverse-cow girl style, just getting your hotdog and not looking at his face.
Yo Magic, still waiting on that girl to leave her boyfriend for you? You a side-dude!

I thought T was your boyfriend? Nope. Side-dude. I love Jason. T is my dessert. Sometimes, I'm fine with the main course :)
by princesspristine October 17, 2014

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When you see more of a man's tackle than expected. Male version of the female "side-boob".
"Kiko bent over and totally had side-dude!"
by Julactus June 01, 2016

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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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.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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

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Vice versa of {side chick}
Girl one: Doesn't Jordyn already have a boyfriend?
Girl two: No, that's just her side dude.
by Aaliyana September 11, 2016

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

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