1. To kiss.
2. To chew gum LOUDLY.
3. To lick your lips after eating something sweet.
1. I love it when he smacks my lips.
2. She sits at her desk smacking her gum and bored outta her mind.
3. She tastes lip-smacking good.
by mamalonglegs December 14, 2011
Get the Smack mug.
I was standing beside this really hot guy watching paint dry and we totally started smacking on one another.
by Kiryk July 3, 2012
Get the smacking mug.
1. Smack Used to mean Herion.

2. Now espically in DC Smack means to talk to someone, like them, and think their cute, you wanna go out with them.
1. I heared he shoot that smack
2. That girl is fine, I'm tryna go smack
by Prec2686 August 29, 2010
Get the Smack mug.
Very,Very, Ugly
Congrats, your Girlfriend is smack. Hope you're happy,
by MissCherryDoll November 30, 2010
Get the Smack mug.