Attempting in vain to remove dirt. You just put the breadcrumbs under the carpet, leaving it all as dirty as before.
Karl: Dude, I'm sorry, cannot go out tonite, my mom wants me to clean up my room.
Bob: So what? Just manclean it.
Karl: Nice idea bro! I'll be out in five minutes!
Single men have no idea of what real cleaning is. They just manclean.