look up any word, like fleek:
When a lot semen has been ejaculated in a single room, the evaporated semen turns into the form of mist. Once the semen is in mist form, the "seamist" can harm a person in two ways. First, it can get all over one's skin and clog one's pores. Secondly, the seamist can get into one's lungs while sleeping. This will result in heavy chest congestion.
"Man, after Benji had all that sex in my dorm room, I swear that every time I walk into my room, I am soaked in seamist."
by Ozmandius April 29, 2010