In multiplayer games where players oppose each other based on some form of rating/ranking/tier system, tierslum or tierslumming, is the activity of finding ways to play in lower tiers than you belong, and hence dominating and gaining rewards or stats much quicker.
Uberganker1337 has a K/D of 4,2, but he got it tierslumming so it does not count.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug