pump cover 

A pump cover is gym slang for sweatshirt. It is called a pump cover because it hides your pump as you workout.

Bro, Jack looks like a complete pussy in the gym until he takes off his pump cover.

pump cover by TheCole0409 February 22, 2021

Pump Cover 

A heavy type of jacket you wear during the start of your workout to build sweat and typically take off to boost ur workout.

Automatically means you had a harder workout than everyone else.

Wow his pump cover came off and his muscles look so big, ‘must be cause he’s getting the hardest on his work out.’

Pump Cover by The president of the Smartest February 28, 2022

Pump cover 

A pump cover is any type of baggy clothing that covers up your temporary pump (muscle swelling) during your work out. A pump cover is often trackpants and/or a hoodie.

You often only wear a pump cover when you start out your work out in the gym. It is believed wearing a pump cover makes you sweat more and warm up faster. Once someone has done their first set the pump cover often comes off.

Largely popularised by "gymtok" in tiktok

Time for my pump cover to come off

Pump cover by AlextheArschloch March 10, 2023

Pump cover 

Wearing a cover, a sweat shirt or like a heavy coat, automatically means ur workout was harder than anyone else’s.

Woah he’s wearing a pump cover

Pump cover by The president of the Smartest February 28, 2022