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Typically used as a wild card, can mean anything
Squelch.
Squelch by wodrave2 January 24, 2026

squelch tail 

A burst of noise (a.k.a. "static") heard after a FM radio transmission ends. The random static sound is actually the radio trying to decipher the ambient background noise into meaningful audio. Usually this noise is hidden from the listener with the squelch function on the radio. In typical squelch systems, the audio circuit is turned off if the radio isn't receiving a signal of a certain minimum signal strength. The squelch tail occurs when the transmission has just ended and the radio circuitry doesn't respond quite fast enough. This is remedied by systems like STE or Squelch Tail Elimination by Motorola which send a brief subaudible tone right before the end of the transmission so that the audio circuit turns off before the modulated signal ends. Creative use of CTCSS like turning off the tone generation circuit on a repeater before the repeater tail will work for radios using tone squelch on both transmit and receive.
My VX-150 has a very long squelch tail.
squelch tail by IrishRepublicanArmy December 20, 2003

Squelch-on 

The female equivalent of an "hard-on" (erection).
"Oi mate, she's got a massive squelch-on for you"
Squelch-on by Whorehay 365 August 16, 2017

Squelch-Meter

The Squelch-Meter is the only accurate way to measure a woman's pussy squelch. The meter goes from 1-10. Pussies with a squelch of 1 have dry ass, Sahara desert pussies. Pussies with a squelch of 10 have wet, drippy, Niagara Falls pussies. A 10 is the best score, but pussies with a squelch of 6 and up are acceptable. The squelch is more important than any other rating a woman can receive.
"Damn bro, Sydney's pussy was a fuckin' 4 on the Squelch-Meter. I'm never hooking up with that bitch again."
Squelch-Meter by vivsnake August 31, 2021

Squelch fart 

To fart out semen from the arsehole.
he loves to "Squelch fart" Peters jizz out!.
Squelch fart by m light August 24, 2006

squelch boot 

Having mad chafe in your genital region cause it to 'squelch' like a boot. Cause by not washing for a while
Bro, I think I have some serious squelch boot. Haven't washed in about a month