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The term "zerbet" was used by Bill Cosby in his role as Dr Heathcliff Huxtable in The Cosby Show i the 1980s to describe a "raspberry", his stage daugther Rudi had given him. A "raspberry" or "zerbet" is the act of putting one's lips against a body part, principally the belly, and blowing air. A tickling senstion ensues.
Rudi just gave me a Zerbet
zerbet by Leon Engelbrecht January 28, 2008
Related Words
zerbey zerbert Zerbe zerber zerbet zebreyiah zerbertious zerby zerdey Zereya

Dirty Zerbert 

As she performs felatio from behind on the penis that is tucked back between the legs the man fires a cum warning in the form of fart on her forehead
Honey, would you rather go have sushi tonight or stay in for a Dirty Zerbert?
The other definitions have the right meaning (a sloppy kiss where you blow, making a farting sound,) but this spelling and pronunciation have diverged from the original, and should be considered incorrect.

This word was first introduced on "The Cosby Show", (Season 2, Episode 11) and explicitly spelled out "ZRBTT". It was also clearly pronounced without the final "r" sound given here. It was spelled repeatedly by several characters. The subtitles as aired on the show spelled it "Zurbitt" when Bill Cosby was pronouncing it as if it were a real word. Part of the joke of this word is that it's a nonsense spelling without vowels.

In the episode, Vanessa was practicing for a spelling test, and Rudy kept interrupting, asking what a series of nonsense letters spelled. The following, including spelling, is taken from the subtitles as transmitted.
Rudy: Vanessa, what does "Q-N-G-H" spell?

Vanessa: Nothing. Give me another word.

Rudy: What does "Z-R-B-T-T" spell?

Vanessa: Nothing!

Rudy: How come when you spell it's a word and when I spell it it's nothing?

Vanessa: Dad, I'm studying very hard for the spelling test, and she keeps asking dumb questions.

Cliff: I don't think anybody asks dumb questions. What's your problem?

Rudy: What does "Z-R-B-T-T" spell?

Cliff: "Z-R-B-T-T" spell? Uh... That's zurbitt. Zurbitt... uh.. You know what I think a zurbitt is? I just remembered. A zurbitt is this:

(makes zrbtt on Rudy's cheek.)

(UrbanDictionary forces me to include the misspelling "zerbert" here.)
zerbert by Irwin M. Fletcher March 18, 2010
The act of putting your mouth on someones stomach and blowing, making a fart-like air noise.
"I was sleeping, and all of a sudden I was awakened by some homeless man giving me a zerber."
creating a seal between a human mouth and flesh (commonly the stomach or arm) and then blowing, producing a fart-like sound.
Wanna hear a funny noise? <zerbert inserted here>
zerbert by Bungalow Bill October 19, 2001
"creating a seal between a human mouth and flesh (commonly the stomach or arm) and then blowing, producing a fart-like sound." --Bungalow Bill

This word was made popular by Bill Cosby on his hit TV show, the Bill Cosby Show.

For most people, it tickles like mad on the stomach, which is what makes it so much fun. Try it out.
"No! Not a zerbert! Gah! No get off!" <zerbert> "Sweet Mother of God it tickles!!!"
"Mwahahaha" <zerbert>
"Oh the humanity! That one was wet!"
<continues>
zerbert by Swede July 10, 2004