The act of slapping the penis until it makes a 360 degree rotation. This can be done individually, through an immature prank, or by sexual request.
1. The man’s penis did a complete swangalang as he hit it out of boredom.

2. The football player swung his arm and swangalanged his fellow teammate while he wasn’t looking in the shower.

3. The man asked his wife to perform a swangalang while they were in the heat of passion.
by Framulation April 4, 2019
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