The mixture of kahlua and root beer. It tastes like an alcoholic version of a tootsie roll.
It was brought to the public eye by the show How I Met Your Mother on the episode "Slutty Pumpkin"
"Ted: So, uh, we're at the bar and I see her mix kahlua...
Lily: Kahlua and root beer.
Marshall: A cocktail she invented herself.
Ted: And she...
Barney: And she called it the Tootsie Roll.
Lily, Marshall, Barney: Because it tastes like an alcoholic Tootsie Roll."
To take the bottle of whatever alcohol you are drinking (wine, whiskey, vodka, tequila, etc) and take a swig and pass it to the next person as quickly as possible.
The next person takes a swig and does the same till it ends up back at you and you repeat till the bottle is finished.
Pausing is for pussies so get that shit into you right away.
Person 1: I got this 40 ounce of Jack Daniels but the movie starts in 5 minutes.
Person 2: Let's just go in guys
Person 3: Stop being a fag, let's just tootsie roll that shit
Person 1 take a mouth full and passes to Person 2, who take a mouth full and passes to Person 3, who take a mouth full and passes to Person 1; repeat till bottle is empty.