Something like "your girl".
A female youre really close with and would do anything for you.
Typically she messin witchu and doing the same things you doing or following in your foot steps.
Really can also be a way of teasing a close female friend that is super short aswell.
Dude 1: You my Lil Steppa for real.
Girl: Omg ty.
They real that going to step on your face and fuck your world up
That's my lil steppa they will beat the fuck outta you for me