A slug is a member of the most elite group of people in the world. They qualify by being the best in every situation, going the hardest in all aspects of their life and they always work to eradicate the anti-slugs a.k.a. ants.
Slug life.
What's up my slugga?
Yo did you slug that girl last night? You're the biggest slug I know!
That Mike kid is totally unchill.
I know dude he might be THE anti-slug.
In fantasy sports, a player who does not meet expectations or otherwise is of no value.
"All my pitchers are hurt, and all that is left in the pool are slugs like Joe Blow."
"I'm not sure why Rick picked Joe Blow in the first round. The guy is a slug."
"That trade did NOT work out. I traded my best guy for Joe Blow, and he's turned out to be nothing but a slug."