Baby I know I ain't that crazy
The scale says heavy
Must be my dick the way bitches been hanging on it lately

from Big Boi (Ft. Yelawolf) – You Ain't No DJ Lyrics on Rap Genius

Meaning

Several women hanging off of your penis would add substantial weight to the scales…

I regret Googling “dick hanging”, and will instead use this picture of a kitten:

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