fleeping is a word in an insult. it is to replicate the usage of the word 'fucking' which is used a lot throughout many normal peoples lives. it means a person who frolicks around like a lamb would leaping, but is more fleeping than usual. it can mean, also within the insult manner again, a person who engages in many sexual activities with old people (fleeper.)
guy 1: shut up you fleeping idiot.
guy 2: well, you're just a fleeping fleeper!
guy 1: *gasps* you didn't! wahhh!! *runs off fleeping*
While a FLERF is a Flat Earther, FLERFing is a verb defined as infiltrating Flat Earther communities and planting ridiculous "evidence" using psuedoscience, woo, or scientific sounding nonsense and gibberish in an attempt to get FLERFs to believe even more ridiculous things.
"What have you been up to?"
"Not much, just FLERFing that new Flat Earthgroup with a theory on avian air buoyency"
"Wow you really need a life"
"I know"