Hz hertz is the symbol for hertz, which is a unit of measurement for determining the frequency of something (or cycles), per second.
Though primarily used in the field of physical science, it can also be used as slang for something, which occurs extremely often, and perhaps concerningly often.
1. Five wavelengths which occur in the time lapse of 1 second has a frequency of 5 Hz.
2. Dude, that frat boy just doesn't know when to stop.
I know! He is bangin' sorostitutes at like 100 hz's!!!