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When a person releases a particulary nasty smelling fart into the room.

a fart which is released from the buttocks, which could be described as being toxic.

hence the name buttoxin.

Butt + toxin/toxic = buttoxin.
Jim: *loud fart*

Jenny: "eugh, that smells disgusting!"

Jack: "that's toxic man."

Jim: "that's a true buttoxin!"

Jenny: "so nincompadrae!!"
Buttoxin by ClareyMcfarey :) March 2, 2010
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The substance or stain left in ones underwear when a fart is mixed with diarrhea.
The buttoxin in your underwear just won't come out.
buttoxin by Roland Warren October 30, 2006
A nasty fart or hella shit
Ah, that fart was Buttoxic

Damn, that Buttoxin is gonna kill some one

Caution, bathroom closed due to a spill of Buttoxin
Buttoxin by pairofpant January 18, 2010

buttoxen 

–noun

1. pl. of buttox. Olde English: Buttock(s)

2. More than one buttocks.
1. Little Jimmy's eyes nearly popped out of their sockets as he gazed across the sea of beautiful Brazilian babes' buttoxen, meandering over the Rio coastline.

2. The public toilet seat was falling off its hinges from years of the fat, pus-ridden buttoxen that pressed firmly against it each day.

3. Your family's buttoxen could weigh down a 747.
buttoxen by Hairy Bungaloo February 21, 2009

buttoein 

the act of having a loved one stick their big toe up your ass, preferrably after a pedicure.
I can't wait to show my boyfriend my pedicure. He loves buttoein after i get my toes made up.
buttoein by gigiti March 26, 2010

buttoxen 

1. pl. of buttox. Olde English: Buttock(s)

2. More than one buttocks.
1. Little Jimmy's eyes nearly popped out of their sockets as he gazed across the sea of beautiful Brazilian babes' buttoxen, meandering over the Rio coastline.

2. The public toilet seat was falling off its hinges from years of the fat, pus-ridden buttoxen that pressed firmly against it each day.

3. Your family's buttoxen could weigh down a 747.
buttoxen by Hairy Bungaloo April 1, 2009

Benjamin Buttoning 

When you are about to plug a girl, but you are drunk so your johnson is a little soft. You shove it in anyway, but during the first few minutes your johnson looks wrinkly and old. Eventually, you become fully hard and the shaft is smooth and young-looking.
Andrew: After the party I took a girl upstairs and gave her the business. It took me forever to get hard and I couldn't keep her waiting, so I did a little Benjamin Buttoning in her clap trap.
Evan: Sweet!
Benjamin Buttoning by Eweezy86 March 7, 2010
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