We use the words sketchy and shady too, but i think out most unique one is Waffle House.
If you see one of you sisters being stalked by a guy at a party or wherever and she looks like she needs your help, you go up and tell her your leaving for the Waffle House, or ask her if she wants to go to the waffle house. Funny thing is there is a waffle house within like a 30 mile radius of us. But it works everytime