(verb) The process of injesting alcohol (normally) by means of funneling/feeding the liquids through a pipe (or more commonly used, a ~ 1-2 in. diameter hose) directly into the stomach.
The object of pipelining is to bypass the gag reflex to give worry free injection of hard liquor.
Works best with 100 proof alcohol.
May acceptably be called 'lining, if you are deemed cool enough to do so.
"I had an awesome time pipelining with you guys last night, you guys are all so cool..."
When you pour Coca-Cola into your urethra until it reaches your bladder and mixes with the piss (making Coke & Piss) then putting a single Mentos mint down your urethra, reaching and reacting with the Coke & Piss, causing a very pleasantdick explosion.
Dude 1: How do you goon, Dude 2?
Dude 2: Either iglooing or mento pipelining.
Dude 1: How does it fit down there?
Dude 2: I'm a monk.