The act of shaking (in ice) an otherwise bland and fratty drink consisting of 3rd tier liquor and chaser with a martini shaker and straining it into a martini glass; therefore bequeathing the class and sophistication that previously eluded what would otherwise be known as a brodrink.
Bro 1: Fellas, I picked up a fifth of svedka and sprite, let's pour this into a cup and make brodrinks.
Bro 2: I don't know bro, I feel like we should change things up tonight.
Bro 3: Tonight is special. I just got a promotion so we're goin all out tonight and making brotinis.
Bro 1+2: Bromance for days.
hey man i'm ordering a pizza..want in?
hells yeah brotini!