look up any word, like plopping:
 
1.
Epic, dope, cool, nitro, mega, awesome, sweet, boss, bank, sick, wicked, rad, gnarly, etc.
Me: Dude, you saw how hard that hot chick was eye-fuckin' me?

You: Yeah, that shit was fuckin' mighty, bro!!!
by Jozay June 03, 2011
 
2.
A word used to descibe the word "really". Used in literal tense and sarcastic tense. Literal would be, "Wow, he is mighty gay". Sarcastic would be "Wow, your mighty cool". This sentence would be used when someone did something they thought was cool, but it wasn't.
Guy 1- Wow, your mighty cool
Guy 2- I know, eh?
by jared benson December 17, 2007