Guerrilla style is getting goods/services with unconventional methods.
Cutting in line is a simple guerrilla style move, yet you have to do it in a mather that other people won't object and/or don't notice.
A other common guerrilla style move is that you asumme you already paid for the goods by forhand. So they give you the goods they maybe doubt if you paid for it, then you give them a big smill and say thank you and walk off with your free goods.
Tom: Why are you spilling your drink all over the place.
Jonh: Oh crap, well i got that beer Guerrilla style anyway.