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1.
When one takes a hard poop then immediately after the hard poop comes out diarrhea follows that poop making a "Liquid Plumber"
Yo I just took the meanest Liquid Plumber ever.
by cdaconto June 17, 2011
 
2.
The use of urination and the plumbing motion of the male genitalia for sexual gratification during intercourse. (a)Urinating inside the female vagina during sex. (b) Pissing inside a woman's vagina immediately before penetration.
Dude Amelia was such a whore last night! I was so drunk and ended up pissing in her before banging her--Liquid Plumber bro!!!
by TeamMP February 11, 2011