cold billin Share definition Flag A cold beer, with no particular affiliation to any brand. Can be drank alone or with friends and family. Goes well with football and grill-outs. Hey bro, why don't you pass me that cold billin? Whaddya doin? Nothin..just drinkin a billin. cold billin by Matt Whitmer February 7, 2007 Get the cold billin mug.