hooking up--if you mean "she totally wants to hook up with him" it sounds like "gettin' it on!" (S-E-X)
if it's like "let's hook up later and hang out" then it means get together.
me,34 exH,34 S,16 months S:3/31/09-left for OW started DBing 10/09 d final: sometime 10/10 current: http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2022856&page=1 met in 2004