"That's/This's my _jam_!"

[Wilson Gray]

In which "jam" replaces "bag," "thing." et sim. Of course, in my lost teen
years, this meant "... is a record that I really like!"

Also heard:

"Think I won't? 'Cause I will!"

Back in '50's StL, this went:

A: "Think I won't?"
B: " 'Spec' you will!"
-- 
-Wilson
-----
All say, "How hard it is that we have to die!"---a strange complaint to
come from the mouths of people who have had to live.
-Mark Twain

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The American Dialect Society - http://www.americandialect.org