Fling on Definition 1 of 2Pro Tip 1/3Speed Implied Indicates you put on clothes in a hurry without much care for precision. Late for class, I just had to fling on a shirt and leave. Pro Tip 2/3Spontaneous Choice Suggests choosing what to wear quickly, without much thought. I flung on the first pair of shoes I found. Pro Tip 3/3Casual Setting Used in informal situations, not suitable for formal events or writing. She flung on a jacket and joined us at the BBQ.