A fuckhead who keeps coming back to bother you, despite the fact that you smack him down, like a weed growing out of cracks in the asphalt.
The fuckweed on the Adventure Rider Internet forum kept up his lame attempts at annoying me, but I ignored him and he eventually went away. He was a real fuckweed.
A fuckweeb is short for a fucking weeaboo, they are people who like anime, have anime posters and figures. A fuckweeb is NOT somebody who just enjoys anime. Fuckweeb is a spin on the insult fuck weed or fuckweed.