its like

if somebody drops a sick line or a sick verse or does something youd concider sick or whatever then yous "buck that" and thats when u make that noise, like if u go to a battle night and guy drops his verse and its just immense, now u wudnt expect a crowed of 200+ to just say "yeah man that was sick as fuck, u merked it" so ud end up gettin a mix of cheers and blaps.