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3.
The more popular term derived from buck naked.

some people still say buck naked, but most say butt naked because the yanks made a cooler version of the term.
Johnny: "Haha, I just saw your girlfriend butt naked"

John Henry Smith III: "You stupid American, it's "buck naked"! Bloody twit!

Johnny: "Haha, Yeah, but we are more popular, and our term is better, so we win by default. Either way, I still saw your girlfriend naked."
by Chad5161 April 14, 2010
 
1.
Americanised version of buck naked. Probably arisen from the Yank inability to speak English.
American: I don't ever get butt-naked when I shower at the gym.
Everyone else: It's "buck-naked," you idiot!
by Jennan the Mad July 07, 2005
 
2.
totally nude(see also buck naked)
Some idiot came out of an alley, butt naked.
by Light Joker November 19, 2004
 
4.
Completely and utterly nude.
You cannot go around butt naked when we are having guestsin the house.
by Light Joker August 27, 2004
 
5.
As in wet, when mixing weed with PCP.
You just smoked all that? I didn't know you liked to get butt naked.
by spencer miller March 08, 2005
 
6.
1. To do something with extreme intensity
2. Something that is associated with above average qualities and good times.
3. To not be wearing underwear.
1. If we want to want to win the game, we need to get buttnaked.

2. The 5 keg party down the street is going to be buttnaked!

3. Did you see Jenny last night? She got buttnaked at the party after we won the game.
by Defiance XC August 28, 2004
 
7.
Not wearing underware.
Asia was buttnaked after serving detention.
by Anonymous July 31, 2002