the act of placing one's hand into the anal cavity of one's body. Pretty much its mostly pertaining to (but not limited to) someone shoving their hand up their own ass (it is possible, just look around on the internet)
1. Jen: So, yeah, I just got the movie Rent on dvd, did you want to come over and watch it?
Bobby: Rent? I'd rather floombash myself with a hulk hand
2. Chris: Hey man, you don't look so good. You feeling ok?
Steve: Yeah, man I feel like shit. I feel like I just got floombashed by Wolverine.
X: I tried so hard and got so far but in the end, I never came.
Y: Wow, you're such a floopan.
Verb form usage:
Rick: Did you manage to get the alien serum in the portal opener?
Morty: I couldn't find the serum, Rick. I flooped big time.
Rick: You're such a dick, Morty.
Floomp alludes to a sound as well as a general description of a failing and/or falling action. It is normally proceeded by the word 'man' or 'geez' and is indicative of a light hearted acceptance of failure.
1) Man, I tried to play it off but I totally floomped down those last three steps. haha
2) Geez, I was supposed to clean the house but I just kinda floomped around the all day.