Hi, I am a Japanese Marvel Comic fan and was reading “Ms.Marvel” . There was one phrase I couldn’t understand:

“I thought my mom was gonna pop out of aisle two and beat you up with a rolling pin!”

What does the “pop out of aisle two” mean? FYI, the situation is as below.

The boy called Bruno was trying to invite Kamala(Ms.Marvel) to the dance party. But she thinks it’s a joke since her parents are so strict that there are no possibility for them to let her daughter go to the dance with a boy. And she says “For a second I really thought you were serious!” and then says “I thought my mom ....”

Please advise.