っつー at the end of a sentence [duplicate]

Question

This question already has an answer here:

• What is the usage of 「つー」, what does it mean and what other ways are there to express the same thing ? 1 answer
• What does っつの mean? 1 answer

What does っつー at the end of sentence mean, I get that its a form of と言う/っていう, but still don't quite understand use of it. And it isn't quotation. some of the sentence I came across using them

私が知るわけないっつーの

自分でがんばれっつーの