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1.
the gagging sound exerted when a dick is shoved to far down the mouth.
I was getting a wicked blow job from this whore this morning and i grabbed the back of her hair and gulched the living shit out of her.
автор: w-body 25 августа 2008
 
2.
A form of burp, which also accompanies a small amount of sick.

As it is a small amount, you generally swallow the sick, therefore you are 'gulching'
"Are you alright pal?"

"Yeah no worries, was just a gulch"
автор: GulchGirl123 5 апреля 2014
 
3.
To puke on your partner while having sex, and to lick it up.
-Ew, why did you puke on me?
-Im just gulching...
автор: tourettes1992 19 августа 2006
 
4.
The area between the anus and the crotch. Usually rife with unkempt pubes.
I can't believe you've never shaved your gulch, that's terrible!
автор: lmnt 4 июля 2004