Stands for exhaling through my nostrils. Used to express more of a snicker than a full laugh, like a lol would express. It can have a sense of sarcasm to it.
An abbreviation in the vein of "LOL" and "LMAO" that is used when a phrase is funny enough to get a slight snort, but not funny enough for a burst of laughter.
"Bro, what did you think of that meme."
"ETMN, man, ETMN"
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!