Flump 

The action of screwing up a line of speech or forgetting what one was going to say

P1: erm dude? I forgot my lines again.

P2: don't worry bro, you just flumped.

Flump by OldManInAShower321 June 5, 2022

Flump 

To Flump is hrumph and to gumph

Man, that guy be Flumpin

Flump by Local Web Surfer June 15, 2023

flump 

The act of dragging your penis across someone's face.

"I'm going to flump you"

"Billy was flumping Jerry last night"

flump by anonymous December 9, 2024

Flump 

That one friend that always bails out on your crew

Yo man, justin is such a flump ! Never comes through for the homies. I invited him to the cabin months ago and he bailed last minute to play golf. We should nickname him flumpy gump.

Flump by Dudewearsmycar July 12, 2024

flump 

someone who is really fucking lazy

maisey is a flump

flump by max4689 July 15, 2025

Flump 

Flat lump. A lump but inverted

Hey Brendan, you have a flump a little above the middle point of your eyes

Flump by OKURNESSEABJ July 25, 2025

Flump Drumming 

Using your flaccid penis to drum on any area of a partners face.
Eg. Cheek, nose, forehead

“Fancy some flump drumming”

Flump Drumming by Jiffster June 20, 2019