A counterfeit representaion of a coin that has similar shape (and possibly similair weight) used to subvert vending machines.
Source: Term at one point was used on the New Jersey boardwalk in the 1980s.
An entity (especially a person) not capable of meeting minimal standard of the productivity that they are participating in, usually used disparagingly.
Source: I use this today as it seems approprite to descibe someone people that can get in your world, but can't deliver.
Ex. 1:
Posted sign: Those caught using slugs will be barred from this arcade.
Ex. 2:
Coach Willaims: You call that Rugby?!! I can get 15 slugs off the street to beat you guys
Girls (or guys, I guess) who can't get over themselves! They beg for attention and take pictures, often showing an excess cleavage or sticking out their ass. The plural to "slug" is "sluggys". Sluggys are often rather stuck-up and obsessed with themselves, and getting a girlfriend or boyfriend. When they do, in fact, have that boyfriend or girlfriend, they tend to say "I love you" too quickly and end up getting dumped/breaking up with them just as quickly. Sluggys are not liked. A synonym to slug is "slore".
Person1- "Oh my goshdid you SEE her tumblr?"
Person2- "I know, she's such a slug."
Person1- "You're like a coin!"
Slug- "Aw, valuable?!"
Person1- "Nah, two-faced."
(: