Define Fill Out Meaning

Fill Out
when girls start to develop into fine-ass females. basically, when they start getting tig old bitties, wider hips, thick ass; all that great stuff.

Middle school kid: Dude! Sabrina is getting more and more boneable every day!

Guy who knows shit: She's starting to fill out, bro. just wait a few weeks and she'll be ready to go.
By Tootsie
Fill Out
"Everything" or All of the above. Meant to convey a full encompassing of the subject.

"How's the cream brotha? You good?"
"Doing good in the fill out, man"
By Jonell
Filling Out Nikes
This refers to when a girl has such a large ass that she can "fill up" her Nike shorts. In other words the shorts become more like tight volleyball shorts rather than looking baggy

Do u see that girls butt? I bet she could be "filling out nikes"
By Belicia
Knocking Her Fillings Out
To make love to a woman in a hard energetic mannor. So much so that it may loosen the fillings in her teeth.

Q: "I heard your bed springs from next door Bob. must have been some session."
A: "It sure was Bill my cock is throbbing i was knocking her fillings out."
By Rochell