Yellow Hammer is a term for a curve ball that not only breaks but has a big drop to it. Another term for Yellow Hammer is a '12 to 6' curve ball. Other terms for a curve ball are 'yakker' and 'Uncle Charlie'.
It means cowardly.
No such thing in baseball.
Hammer Toe is hammer digit. It refers to a deformity of the middle joint of a toe, normally the large toe or baby toe. See link below from the National Institutes of Health.
Ring hammer.
"Yellow" is a term used in Boys lacrosse which means to slow it down,or hold onto the ball.
toe
The name for the hammer of Thor is Mjohnir. Other than that I have found no formal name for "war hammer."
The term "peen", when used as a noun, refers to a part of the head of a hammer. When used as a verb, it refers to the process of working metal with a hammer.
in baseball, it means that the bases are loaded.
In baseball, to "win the pennant" is to finish the season in first place of a division or league.
hammer time
Hallux malleus