Get the drop on 

to get the drop on someone means to gain an advantage through the element of surprise in a fight.
some people will tell you this phrase originates from fortnite. i have been using this phrase since before their parents had found themselves infertile and decided to adopt.

If we attack now we can get the drop on them.

Get the drop on by SoldMySoulForAChickenBurrito December 31, 2020

Get the DROP on a Nigga 

To somehow one-up an opponent in a battle, usually by being faster or more skilled with weapons.

"I cut a hole in my t shirt right near the ass so I can whip out my gat and get the drop on a nigga"

Get the DROP on a Nigga by FeckingBatman August 26, 2008

to get (or have) the drop on someone 

to get (or have) an advantage on or over him/her/them.

to get (or have) the drop on someone by Mr. Terrence L. Trezvant October 5, 2003