This feels a little light

When someone gives you a bag of groceries and it feels like there's a few things missing because the bag feels a little light. So you go back to get the rest of the groceries. When someone hands you speed (Amphetamine, Ethylamphetamine) after you paid money and the gram of speed feels a little light more like two thirds of a gram to three quarters of a gram. So you weigh it and demand the rest, and they give you more. Or if you're buying 5 dollars of cheddar cheese and it feels more like 3 or 4 dollars of cheddar cheese so you ask for more. When you're in college studying organic chemistry, mathematics, history, geology, and you forgot a book because the bookbag feels a little light. When you make money selling coffee and the stack of money they pay you feels a little light today. When you ask a friend for half the energy drink and they only give you a third and you say this feels a little light, so they pour more. It means it's not enough or something is missing.

This Little Light of Mine is a game that is loved by the homosexual male community. The rules of the game are simple. All you need is a room full of gay men and glow sticks and you're ready to party. First everyone gets naked and erect. Then each person breaks a glow stick and applies the now glowing Phenyl Oxalate fluorescent dye and Hydrogen Peroxide solution on their genitals. After that the lights are turned out and the game doesn't end until each person hides their light in someone else.

Effete, a bit of a poof, possibly homosexual

it means someone watching you, bro

an alternative to saying the "glow" term which some find offensive