an untalented footballer; a less than gracious description of players possessing slightly grittier or physically intimidating skillsets than others; a phrase employed by the more tactically-challenged manager.
Coach : "I'm keeping the cludders on the bench this afternoon, we'll bring them on if we need a bit of muscle later in the game"
An "extra" day of the week unlocked by having Sunday a day early, enabling you to spend Cluderday doing all the things you normally never have time for.