An expression that expresses the seriousness of a situation and a potential terrible result if a remedy is not found. Reference to children's Christmas specials where the plot centers around saving Christmas.
'If I don't find the bathroom soon, there's not gonna be a Christmas'
A decisive expression to indicate the last chance to save other lives when you are the responsible for them.
Capt. Chesley "Sully" Sullenberger made a final radio call to the air-traffic control tower from his crippled jet: "We're gonna be in the Hudson" before he glided the plane into the river rather than risking a catastrophic crash in a densely populated area, saving the lives of all 155 on board.
"whose ass is it gonna be" or WAITGB is used when trying to figure out who is to blame in a situation, usually to punish them.
Person 1: Someone robbed a helpless elderly man.
Person 2: Alright, whose ass is it gonna be?
or it can be used jokingly
Person 1: Someone leaked a majorspoiler for a highly anticipated movie.
Person2: Whose ass is it gonna be?
Teacher: And that is why the Texas flag has only one star on it.
Student: Is this gonna be on the test?
Teacher: .... Yes... you know what? Every word I utter from now on will be on your test. And, no, I will not slow down my lectures nor will I lessen the amount of information I will continuously vomit until the very second the bell rings.