One of those words that you use when you're in a class and you need to express your discomfort or anger, but the teacher is standing behind you, so you can't swear your heart out.
Or one of those words you look up in Google just to see if anyone else has defined it yet. Which they haven't.
A slutty freshman who decides to become your best friend and talk about every guy see sees and talks about boning them. A flagergheist is such a whore there is no other word to explain it.
person 1: yo that new freshman is wearing the most revealing outfit and is all over matt!
person 2: What a flagergheist!
An ultra-patriotic individual who sees their nation's flag as something sacred. The individual generally shows profound love for it through speech and displaying it ubiquitously to the point that others may think he or she has sexual feelings for it.
The product of stuffing blue cheese and truffle butter into a coochie for a minimum of 13 minutes. The chemical reactions should leave a pungent frothy foam blanket to attract attention.
Troy: ay bruh, how was the date with Kate?
Tj: bro I told her not to wash for the last few days so I could taste her flagloochie *sniffs the airhornily*