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SMT Mainline 

A Canadian Youtuber who is known for his model train content and taking shots of maple syrup he is also allegedly a foamer
Did you see SMT Mainline’s video of that CP heritage Unit

Jack the mainline 

Doing heroin intravenously in the style of Robbie Williams. See also rock the mainline.
From Robbie Williams' "Rudebox":

"Ok then check the tan line
Make your body shape
Like you're stood on a landmine
Call me on my mobile
Not the landline
And jack the mainline
At the same time"
Jack the mainline by Some Fresh Money September 18, 2007

Rock the mainline 

To get "high" on heroine through the means of an introvenus-needle. I.e. - Shooting up.
Addict: Yo, dog... Yo got the shit to lemme rock tha mainline?
Dealer: Fo' sizzle ma nizzle, that'll be fiddy.
Rock the mainline by God May 20, 2003

mainlining

the intravenous injection of a drug. which means using a needle to get a drug into your vein, to absorb it through your bloodstream. a lot of drugs can be taken this way, the most commonly associated drug being heroin.
Layne accidentally overdosed by mainlining heroin.
mainlining by two blue lights December 9, 2008

coefficient of manliness 

It is a coefficient calculated by dividing your " penis length" by your height and then multiply the result by 100. (MaN=(penis length/height)*100).We measure it in cm and the final result will show us the percentage , how much of your body height is your glory.
What's your manliness coefficient?
I've got higher coefficient of manliness than you
What is your boyfriend's coefficient?

Main Line Mom 

Main Line Moms are overattentive, overinvolved, pampered, prissy JAP-spawning machines. They'll fight tooth and nail for their kids to get undeserved As and not just because they do all their school projects for them. They hire tutors for $80/hour when their kids get an A-, shuttle their kids and their lacrosse equipment and golden retrievers around in their Landrovers, and know all the gossip about their kids' classmates before they do. Main Line moms peak at college admissions and Bar/Bat Mitzvah seasons. They tread the line between passive-aggressive and aggressive-aggressive and if you're skeptical, try Nordstrom Petites during the semi-annual sale or getting a parking spot in Suburban Square. They adore gays but they lock their car doors when they see a black person. A true Main Line Mom keeps an immaculate home and garden, but only because of the coterie of immigrant gardeners, house-cleaners, and babysitters they employ. Main Line moms know that they deserve the world and so do their kids. And they won't let you forget it.
Lower Merion High School Student 1: My mom found out from Laura Cooper's mom who heard from Robin Goldfarb's mom that Rachael Silverberg gave Jake Weinstein head under the table at Adam Rubin's bar mitzvah.

Lower Merion High School Student 2: OMG, the Main Line Mom gossip network is out of control.
Main Line Mom by xoxo_MLgg December 5, 2009