http://onlineslangdictionary.com/definition+of/get+(one's)+groove+on
get (one's) groove on   
verb

to have fun dancing; DANCE (ONE'S) ASS OFF. Also get (one's) swerve on.
I'm going to go get my groove on.
Yeah, I was at that party; I really got my groove on.
Submitted by Matt L., San Antonio, TX, USA, Jan 04 1999.

www.mundodasgirias.hpg.ig.com.br/paginagiriahiphop.htm

Parte da música que se repete, determinando os ritmos.

http://onlineslangdictionary.com/browse/g/page8

to get into the groove.
On the dance floor little Suzy is really getting jiggy with it.
Submitted by Gordon M., Vashon, WA, USA, Jan 20 2003.

Hope it helps.

PP.