A regional word when used in this context..similar to Crunk, ballin', fresh, ill, sick, sweet, hype, etc.
other versions of word include; rowdiest and rowdyness
"They've been drinking and getting rowdy since 8 a.m."
Very similar to lil john's crunk.
Joe: I gots two dozen frosty brewskies ready for action!
Bill: It's about to get rowdy bitches!
Joe: Fuck yea beeitch.
"We all rowdy and bout it bout it from the south nigga" -Magic & Master P "Ghetto Godzilla"
Nopey: True....They're hella rowdy!