What does fling him mean?

fling verb (THROW) to throw something or someone suddenly and with a lot of force: He crumpled up the letter and flung it into the fire. chuckHe read the letter and chucked it into the bin. flingHe crumpled up the letter and flung it into the fire. hurlIn a fit of temper he hurled the book across the room.

What is fling slang?

1 : an act or instance of flinging. 2a : a casual try or involvement. b : a casual or brief love affair. 3 : a period devoted to self-indulgence.