Panel 1: Now that the practice has wrapped up, we find Gordon and Mike propping up the wall next to some lockers as the cheerleaders walk towards the girls' locker room.
Panel 2: They stand there with a blank look on their stupid faces as we see Allyson walk by.
Panel 3: A few seconds later, the procession peters out.
Panel 4: Mike and Gordon might not have gone BOIIIIING!!!!! but given that their expression puts me in mind of Farley when he's about to eat something, I think we can get the message Lynn is sending.
Summary: Said message is, of course, "dumb horny boys fall apart and make ugly fools of themselves because evil husband stealers with big chests like it." Ah, well. Tomorrow, we get to see why it is Gordon asked Mike to hang around after class.