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!!!!!!!!"
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.