Practice of filling all 3 orifices of a female by either penis, or objects.
A penis in the ass, pussy and mouth at the same time, or a combination of penis and vibrator/dildo.
My wife likes to be made airtight by having my cock in her mouth, a plug in her ass, and a vibrator in her pussy.
A hazelnut is simply a Hater. Someone who hates on others and what they do.
Robz: I got some fire, hit me up.
Robz: Your a hazelnut