Shillack: (Verb) to chill in slacks (eg. jeans, khakis etc…) while watching TV and eating cereal.
Ex. 1: We were shillackin in the mornin' before class watching Sportscenter and eating Captain Crunch.
by jtruongie February 17, 2005
Someone who takes large objects up the pooper then sucks them clean. Then meets up with a Diehl for some afternoon delight that involves whips, a Sigfreid and Roy DVD, three gerbles, his mothers undies, taco meat, a nine iron and 3 pills of valium which he uses as a supository for euphoric effects around the anus area. A Shillack has never gotten a boner from a girl... ever. The only thing that gets a shillack off are Chippendale dancers and pictures of Lance Bass.
Last time I invited a shillack over, my valium perscription was missing and he was wearing his moms panties on his head.
by The Great Z-Dubb October 22, 2008