Picture 'Kiss not come out swingin'
The idiom to come out swinging means to aggressively attack (usually not physically).
As far as lyrics go, Jada always packs a punch, which is what he is commenting on. This line always builds on the earlier line about their beef being a boxing match.
To help improve the meaning of these lyrics, visit “Checkmate” by Jadakiss Lyrics and leave a comment on the lyrics box