What is Clackin' It?
1.
The sound of friction between two or more bodies while performing sexual thrusts during sexual intercourse. Can be performed in any situation either hetersexual, homosexual, or mastubatory if the sound to the palm of the hand slaps the skin while masturbating.
He was pumping her doggie, clackin' it hard, while she came all over the bedsheets. CLACK! CLACK! CLACK!
See