CosmicX

When you fumble to impress a bitch by comparing her to the nerdiest shit ever. Typically used by males with low sperm count, who use it as either an intimidation tactic, or a strange compliment. It's unknown what exactly it means, the name may be a pun of sounding like a rocket-shaped penis, this is supported by being accompanied by the phrase "blasting off" in some places, and has been the star of shitty fake home videos.

It's unknown why soyboys tend to use this word, as absolutely no one would find it attractive in any meaningful capacity, but many presumably try anyway. Early uses appeared on the incel site 4chan, the earliest source is an anon who completely unironically called himself "Doog, Harnesser of CosmicX, Blaster of Babes" but it is likely to have originated earlier.

Being called a CosmicX references the earlier half of this definition, meaning you have fumbled to impress someone by being just too nerdy.