The intense headrush and subsequent complete knockout punch that comes immediately after smoking a gigantic rip of marijuana out of a bong. Typically the person experiencing bongface is incapable of speech or even thought for about one minute, after which the high disperses throughout the body, and the user becomes pleasantly blazed.
Person 1: /takes massive bong hit
Person 2: Dude, you're about to get the craziest bongface.
Person 1: /incoherent speech while closing eyes tightly and putting head in arms
The look a person gets when they try their first beer bong. A mixture of surprise, pain, and joy. Usually the eyes become huge, but then revert to normal in an attempt to act "cool".
When he first triet that beerbong, man, you shoulda seen his bongface, it was crazy!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.