The valve(s) found on a brass-wind instrument that are opened to release saliva accumulated while playing.
You're rattling. Empty your spit valve.
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when an unusually tall girl is giving a man a rusty trombone in the 69 position while pissing in his mouth
"That Josh Watson is a lucky man dating that ckick basketball player, she's so tall that she spit valved him last night."
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When receiving a rusty trombone the man flatulates on the hoes tongue.
Yesterday Timmy gave Alicia a rusty spit valve and she was mad.
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emptying out the spit valve
-verb
A. The wringing out of the testicles during the course of a rusty trombone.
B. The drinking of accumulated sweat, saliva, and/or anal discharge wrung out from the testicles during the course of a rusty trombone.
Even as Crystal was emptying out the spit valve Bobby demurred: "But Tuesday's steak night honey - why can't we go to Ponderosa?".
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A Woman who cannot seem to swallow semen. She spits it out.
"Hey man did you know Morgan is a major Spit valve?"