Giving a reach-around handjob to an overweight man while spitting (including flem or small amount of vomit) into his anus, before tonguing it. Similar to a Rusty Trombone.
The person had a bad cold before giving a rusty trombone to a hairy fat dude, and then sneezed in his ass. It turned into a Swamp Tuba (or Swampy Tuba).
by arzole January 12, 2010
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