Top Definition
In the sercumstance when ones fart is so hot it feels as though lava is oozing out the ass.

Known to leave a hint of sulfer in the air.

OMG!!! my ass ring is so hot and I smell sulfer, I swear theres lava in my pants...ow..I must have lava butt.
by ZACH and alex October 07, 2005

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The condition tha occurs when eating something so damned spicy that it burns the anal tract. "Spicy in, spicy out". Also these symptoms will arise when eating bad food or ingesting items that have been in the refrigerator for way too long (i.e., leftovers from a restaurant that is now out of business).
Hey, I'm gonna enter that 100 hot wings eating contest. Dude, you are so gonna get lava butt. Yea, but I'll win $100.

I didn't think the Christmas casserole went bad, but I ended up with a real bad case of lava butt.
by piratemaxx February 15, 2009

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Lotsa space for your liquids.

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Your favorite word on a white mug.

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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).

Buy the t-shirt