A drink mixed directly into a soft drink can. For example, if you're making a rum and coke or a jack and coke, drink some of the coke, then pour the liquor directly into the can. Then, other people think you're just having a soda. Ideal for situations where you'd need to camouflage your drinking.
Dude, I'm going to this party and EVERYONE there is against drinking, so there won't be any booze. It's cool though, 'cause i'm bringing my flask and I'll be coke can cocktailing the whole time!