1)Said in Halo3 when killing someone charging at you with a sword
2)The opposite of Bullshit
3)Pulling something out of your ass and it ends up being correct
A person or person's ass predisposed to exceedingly loud expulsions of gas from the anal regions. Usually refers to a temporary condition of said effects.
See also 'magical buttrumpet'.
'Man, I gotmad buttrumpet today, must be the beans'
'You've allways got buttrumpet stinkhead!'