Blowing into your partner's arsehole while reaching round and wanking him off. With your lips pursed around his ringpiece and hand movement you will resemble someone playing a trombone
Give me a Dirty Trombone, baby, and I'll buy you 20 cigarettes
by Cwilliam September 27, 2006
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When you pucker up and play a tune on a man's asshole while you trombone his cock.

Hand gestures really help to explain this one.
Eric didn't know how dirty Yvonne was until she gave him a Dirty Trombone...then he knew she was the gal for him.

or

Jeremy gave Todd a Dirty Trombone, and then they went rollerblading.
by Monkey Boy K July 5, 2006
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haha when danny tells you that a kid in his class tells you that if you blow in some dudes ass hole and jack them off from the back it looks like a dirty trombone hense...dirty trombone
wow alex workman "played" the best dirty trombone on me last nite ...phew
by mikey shabsove March 13, 2004
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While you are with two girls at the same time, you do one chick in the ass while the other licks your dick as it goes in and out like a trombone
Hey I did the dirty trombone with your two sisters last night.
by Dirk March 24, 2005
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You have a female/ life partner sit on your lap. that partner then shats on your penis then proceeds to spread it around the entire shaft. You then take hold of your meat-stick and stick it into any hole off your choosing on the body of your partner.
Your vagina smells like you had a dirty trombone
by GettinDatPussy April 29, 2011
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