A greasy or sweaty person with low personal hygiene, a 'Slug' is also someone who is slow and sort of squelches around in their own sweat. Usually shouted at the someone with these characteristics.
Forget slug meaning a bullet. This makes more sense and you know it does.
(a fat sweaty spotty person squelches past)
Guy 1: Awww look at that, urrggh do they know what a shower is?
Guy 2: S...S...SSSLLUUGG!!
Guy 1: Bahahahahahahahhahaha what the hell, slug?
Guy 2: yes, oh yes...Slug
To rub one's wet vagina across a surface.
I was unhappy with the level of professionalism provided by my gynecologist, so I slugged the exam chair before leaving.
When a man pulls his penis out of his partner leaving a wet trail as he drags it across her leg.
When I pulled out of Jordan's mom I gave her a slug.
A phrase used after releasing flatulence to excuse yourself, and to warn possible victims of the oncoming slug epidemic.
Hey man wasn't that fun! (fart) NO SLUGS my bad..
Cindy (fart) NO SLUGS i love you.
Yo Tracey wanna kick it with me and KK (fart) NO SLUGS
feeling fatigued or shitty; describing a poor perfomance.
"man, i woke up at 4 and my grill was SLUGGED"
"that test slugged me up"
Slug means any kind of bullet or round in most urban areas. The proper meaning when talking about amunition is a solid shot gun round that is fired from a rifled bore shot gun, making slugs the most accurate type of shot gun round. Rifled slugs are also available for shooting slugs through smooth bore shot guns. In the Baltimore metropolitan area, a slug means a dollar, typically a dollar bill. It's usually used when asking or stating to have or borrow a dollar rather than stating the cost of something that is worth a dollar.
Let me hold a slug so I can get a rillo from the store. -Baltimore region.
Shawn caught a slug last night. The doctor said he might not make it. -Most urban regions