lemme get the cheats more "explained"
plasticman = longer reach/arm
thetwins = infinite bullet time
gordonfreeman = immortallity
mooninites = bunny jumpin'
lockjaw = hank from MC 6
tehsavior = do i really need to tell you what it is? (Jebus)
trikkeh = isn't it obvious?
undead = play as a green faced + face (hhahahahahah ahh.. ah... cripe my jokes are crap ;-;)
clownkillsyou = laser guide (i dont know if this relates though)
heavyartillery = minigun (hahaha! little man is real man now, POOTISPENSERHERE! >:C)
chuknorris = kill everything instantly
booster = become Sanic
selfdestruct = nuclear explosions ( every enemy has grenades, launchers and stuff related to explosion)
jackiechan = close range combat, karate only! 私はあなたが翻訳者を使ったと思う
Dethklok = infinite ammo
and finally
realitycompromised = all cheats ingame (OMFG!) I just copied this so I Dont have to scroll down