request what means the hack??

i have seen many hacks not to EU but there is some hacks that i don't know what is and i ask if some1 could make a guide with what the hacks mean like OPK

FAIL______________________________________________ ___

OPKmeans one position kill like u go somwhere on map and all enemy ppl are standing one spot and u just kill themthey cant do anything:P

ok thank you, but i meant a guide with what all kinds of diffrent hacks does. OPK was just an example