Meaning 1
When the New England Patriots were accused of under-inflating balls during th AFC Championship game of 2015 in order to give Tom Brady an advantage.
Sentence 1
Remember when deflategate happened back in 2015?
Meaning 2
Any potential instance of cheating, especially in sports.
Sentence 2
They are doing suspiciously well, I hope we aren't going to have another deflategate on our hands.