You're in the jungle now baby is a phrase one may use when explaining to someone that they are about to get royally fucked up. Use this phrase before knocking someone out with a haymaker punch
*cop lady and drug dealer square up*
Cop lady: I'm gonna twist your balls so tight
Drug dealer: You're in the jungle now baby (Proceeds to wind up and throw a textbook haymaker punch, throwing the cop lady clean off her feet and knocking her the fuck out)