Any level of hooking up or making out.
To fully lace is to have intercourse.
Oral lace is felatio or cunnilingus.
etc.
ex:
- "I laced his/her face."
- "I went back to that naughty teens dorm room after funneling, like, twelve beers, or something, and we laced."
-"yo, after the prom, did you lace?"
1a. "Have you tried that trick yet?" "Man, I laced that shit"
1b. (while playing Halo you snipe someone) "Bitch! You just got LACED!"
2. "Man I laced that shit the first night"