If you are not home, then we havin' ya kids
A triple entendre:
If you aren’t home, Wayne and his gang will fuck your girl, and the children she has will be theirs, not yours.
Continuing from the “havin' ya ribs” line, they could be eating (“having”) your kids.
Most likely however, they are going to kidnap your kids. (See the next line)
To help improve the meaning of these lyrics, visit "Get High Rule The World" by Lil Wayne Lyrics and leave a comment on the lyrics box