When someone takes a hit of some form of marijuana(joint,bong,dutch/blunt,bowl) does not let the smoke out, then drinks some type of alcohol. Like a beer or some shots of whiskey vodka or tequila etc. Then after drinking lets the smoke out.
Some people smoking weed and has a bottle.
A guy is all like yo lets do a swirl.
They pass around the weed.
Everyone takes a proper hit.
Then drinks the alcohol.
Bam you got a swirl