When an attractive female walks into one such establishment, such as McDonalds, Burger King, White Castle, G.D. Ritzys, etc. The first "playing" employee to notice said female will call out "fry check" followed by the girls location so that all other interested employees know and have a chance to grab a glance.
Great way to help pass eight hours of flipping burgers.
While men are usually the only ones interested in actually seeing the "fry check", girls are often involved in calling them out when spotted. This can also be turned into a game where the first to call the check is awarded a point (or fractional points for semi attractive girls) and at the end of the night the winner is bought a coke by the others playing. You can add any twist to this you want.
All other players do their best to see the girl driving the car at the drive window an award points as needed.
"Fry check on 2" = hot girl on the second register up front