I. gim‧me1 /ˈɡɪmi/
a way of writing the non-standard spoken short form of ‘give me’:
Gimme the ball! [TahlilGaran] Dictionary of Contemporary English ▲
II. gimme2 noun [countable] American English informal something that is so easy to do or succeed at that you do not even have to try:
The victory was a gimme for the New York Yankees. [TahlilGaran] Dictionary of Contemporary English ▲