To administer a hard open-handed slap sufficient that it causes mucus that was formerly inside the recipient to come out rapidly.
by Snappie August 7, 2008
A phrase used in Afrikaans in South Africa to explain to someone how hard you will slap them in the face. Used commonly by drunk men or angry old tannies (aunties)
Jan: Pieter you must stop bothering me now man or I will klap you that your snot spray over there!

Pieter: A snotklap doesn't scare me bru, come at me!
by BigBullManMilkers January 22, 2023