In general, the cheesy mcelroy is a sex act in which you dump a plate of warm cheese fries on your partner when they aren't expecting it. The cheese fries may be from anywhere, and what you do after (eat them or throw them out) doesn't matter. However, the surprise is necessary, otherwise it's just weird.
cheesier mcelroy (same as the cheesy mcelroy except with more cheese)
cheesiest mcelroy (at this point you're just dumping queso dip on your partner)
hard cheesy mcelroy (basically you throw them as hard as you can at your partner)
WARNING: PLEASE INSURE THAT THE CHEESE IS NOT TOO HOT! IT CAN CAUSE BURNS!! DO NOT USE HOT CHEESE!
So he was really going at it and the all of the sudden he up and does a cheesy mcelroy! I didn't even know he had the cheese fries!