"That's not it" commonly used as "Das not it" refers to someone or something being so irrelevant and unpopular that it or they become not it.
Being not it means that you and your comments are so irrelevant that no matter what you say after you cannot come back to "it" status for a good 30 minutes at least. Unless you so not it that it's impossible, this happens a lot as well.
The complete opposite of "Dassit!" Which means of great acceptance and pleasure. You either "it" or "not it".
Guy one: "Had 2 Big Macs with Gustavo for lunch while listening to the new 2 Chainz song, DASSIT!"
Stop doing that. Stop LETTING him do that. You people are fucking idiots. What the actual fuck is wrong with you?
Hym "That's not what it's called. That is not what is happening there. Your assertion is that HIS DERANGMENT... About how successful you are... Made HIS SON kill him... As opposed to something he was maybe doing to his son... Like, is that what happened to family in Wausau who were killed by their own son? The parents were ALSO so deranged by the outcome of the election that THEIR SON... Killed them. Do the kids love Trump so much that that have to KILL THEIR OWN PARENTS to defend him? Or is it probably something else? Like, the LIKELY... That it is MY THING... Is SO MUCH HIGHER... Than the likelihood that it's THAT... What the actual fuck is wrong with you?"