A fart that sounds like #A on a music sheet. They will make you crap your pants if somebody toots one out.
The kid in front of me played his ass trumpet during the test which caused me to shit all over the person behind me.
by Lanosaurus! January 14, 2005
A fart so loud it sounds like one is playing a musical instrument out of there ass
Baxter made such an ass trumpet that it sounded like a synphony was playing out of his anus; that mutha fucka stank
by Stephen Siciliano January 17, 2004
Often used phrase by Dan Hardcastle on his youtube channel Officialnerdcubed when he messes up something, usually in an intense situation.
"Oh oh oh trumpets. Ass Trumpets. Spinning, reversing, turning." - Said by Dan in 'Nerd³ Challenges! Five Stars - GTA V' posted November 14, 2014, when he spins out after flipping over his stolen police car running from the police with a 5 star wanted level.
by JohannFarley November 14, 2014
An asshat or asshelmet that makes so much noise or commotion that one cannot help but notice the fact that he/she is an asshat or asshelmet.
Eagle is the worlds biggest asstrumpet.
by EagleSJ January 31, 2005
When you blow into someones asshole like playing a trumpet.
I tryed the ass trumpet on cindy last night, she loved it!
by AssTrumpetier September 01, 2006