slimgillian Share definition Flag something to yell while drunk in a public place, typically used in small venues, or at bars. Slurred pronounciation is key. a band has just stopped playing. "Slimgillian!" slimgillian by Cody2000 April 11, 2005 0 0 Get merch Get the slimgillian mug. Buy Now — $32.95 See more merch