fresher's tolerance

a temporary increase in alcohol tolerance coupled with a temporary decrease in the amount of sleep required to function, experienced during fresher's week of university

person 1: "how are you surviving? we've been plastered everyday and only had 7 hours sleep this whole week"
person 2: "fresher's tolerance, innit?"

trip over oxygen

when someone trips over nothing and just hits the ground

watching a horror movie when someone randomly falls: "what did that bitch do, trip over oxygen??"