read your pump
To read one's pump is to notice when an individual has recently lifted. Often used as a compliment or praise, acknowledging another individuals swollen muscles.
"Hey bro, your arms are looking juicy af right now. You do arms today?"
"Yeah, I did actually, how'd you notice?"
"Brother, I read your pump"
"Yeah, I did actually, how'd you notice?"
"Brother, I read your pump"