Instachub
When something is so hot that it give you a chubby (partial erection) instantly.
Seeing Jessica Alba in a 2 piece gave me an instachub!
Instachub
When a girl posts a hot picture to Instagram bad you become instantly erect.
Daulton: Dude did you see Ashley’s Instagram picture?
Matthew: Oh my god yes it was so hot it gave me an instachub.
Matthew: Oh my god yes it was so hot it gave me an instachub.