look up any word, like hipster:
 
1.
Quacking is a term which refers to the loud guttural sound which reverberates from a females esophagus as a penis is thrust into it and then removed forcibly creating a suction-force induced sound which resembles the characteristic harsh sound uttered by a duck.
"Yo dude !! - I fucked that bitches throat so deep and hard last night she was quacking! :"GWACK GWACK GWACK GWACK!!!!!!!!"
by Dr Seymour Butts November 20, 2012
 
2.
1. verb, to quack.
To talk crap.
2. verb, to quack.
To talk really fast so that only people on the same wave length or with special hearing aids can hear you.
1. What was Dr Mallet quacking about in Physics?
2. Jeez did you hear Laura quacking? Swear I don't understand a word she says.
by AJ_legend February 20, 2008
 
3.
In a cycle race, when riders are bumping and grinding for a better position in the peloton. This sometimes results in riders being pushed off the road or into the "gutter."
After the race, Tom exclaimed, "Riders were quacking in the peloton all day. I almost got pushed into the gutter several times."
by headofsteam October 06, 2013