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1.
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 got mad buttrumpet today, must be the beans'
'You've allways got buttrumpet stinkhead!'
by Unkle Funk April 14, 2008
 
2.
to but trumpet someone is to blow through their anus and giv them a hand job at the same time, may also be said "to trumpet someone"
"that dirty bastard tried to give me a but trumpet"
by retardedgoatfucker January 10, 2008