get the chicken

When you going to workout at the gym.

"tryna get that chicken" is a reference to the word known as dick or getting laid.

when you are going to ejaculate all over a female
To bust a nut on a hoe or several hoes
When a female is so turned on by a guy that she creams her panties
Have sex/orgies in which females get dirty, sweaty or nutted on

Literally, to get them chickens messy with bbq sauce during a bbq cook out

When your girlfriend comes up behind you, acting completely harmless and then proceeds to wrap all her limbs around you and wrestles you to the ground so you are face up staring at the bright ceiling lights. Now you are restrained down on the ground feeling as though you are a roasting chicken beneath the bright oven lights with absolutely nothing you can do but be cooked alive.

The imperative version of keep fucking that chicken, get fucking that chicken encourages and commands the listener to stop dicking around and make real headway towards whatever it is they say they want to do.