Prior to chewing a thick gooey substance, keck occurs when one's mouth is extremely sticky and full of foods such as chocolate or peanut butter. This is normally an uncomfortable experience.
To fist fuck mid eastern donkeys while chewing grape bubble yum with one eye open all while trying to penetrate one's own anal cavity with inanimate objects bought from a gypsy.
Dude...I did some drugs in the desert and totally kecked all nightlong.