A large party, often marked by lavishness and showiness. Derived from two filipino words of varying dialects - pamanhickan and parmalaiyee, both meaning a pre-wedding get together in which the marrying families discuss their input to the wedding, and hence show how much clout they will carry in the family.
The X and Y families will host their permahickey on Thursday, two nights before the wedding.
When used in a broader sense:
There will be a permahickey at Liberty park for all the residents of the barrio Z.
Noun. A sorostitute with which you are in a long term relationship, and thus sleeps at your apartment, house, or fratcastle more than she sleeps at her own sorority house.
Jess - Do you ever sleep in your cold air bed anymore?
Courtney - No, I'm a permashacker at Joey's fraternity. I can't remember the last time I actually slept at our house.