Shotgun is how you drink a beer to... been called that since my dad was my age...

top, open
__\__
| |
| |
|___| <-- stab a hole here, when you start to drink, not before.

start chugging it, it flows threw like a beerbong.



I heard the term shotgun for smoking when you take hits and breathe it into a balloon and then keep breathing in an out for a minute... doesnt sound to great in my mind.

"Guess its more common a US slang than UK one." + I Agree