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1.
When one seriously needs to defecate, the feeling of needing to have a bowel movement.
"Wow Gary, I'm seriously holdin' heavy here. Can I use your can?"
by GayJM March 26, 2010
 
2.
To have something bad ass real glassy
You see that boy Slim pullin up on his big body on elbows that boy Holdin Heavy
by HoustonHolds December 28, 2010