T-Offing
The act of when someone has done something that is either very numerous or

Very stupid often resulting in everyone in the room laughing at the person. You would normally use this phrase when you are out with a new group of friends , typically from Toronto who use a variety of slang that you have never heard before or can’t understand , so to make yourself not look like a wasteyute you make up a word in order to make them think you're “with them shits”. As a result you use the phrase “T-Offing”.
Ivan: yo fam I heard Gary flopped on linking the mandem over sum battry ting.
Gianluca: “YO SAY WORD THIS MANS T-OFFING “

Ivan: “Yo fam what the fuck are you saying that’s not a word retard”