anal sex so vigorous, that it ultimately ends in the demise of the "railhawkee".
Variations include:
Mailhawk- a railhawk performed by a mailman or in a mail truck
Flailhawk- a railhawk, but you move your arms around a lot
Jailhawk- don't drop the soap
Prevailhawk- no such thing, you can't survive a railhawk