A colloquial, often derogatory pronoun referring to a group of people or things near the speaker — 'these guys,' 'these ones.'
こいつら、また遅刻してきたよ。
These guys are late again.
あの店員、こいつらと態度が違う。
That clerk treats them differently.
こいつらは冗談が通じないから、真面目に説明しよう。
These people don't get jokes, so let's explain seriously.