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1.
A straight, curved or circular piece of metal used as jewlery for piercings. Has a ball on each end that screws into the shaft. Can be made of stainless steel, titanium or niobium. Sometimes acrylic plastics are used. The different shapes often get stupid nicknames, such as belly "ring" (a curved barbell); horseshoe (circular barbell) or tounge "ring" or "stud" (a straight barbell). See also cbr.
"A 14g circular barbell"
by Shinku February 15, 2004
53 24
 
2.
A straight, W-shaped or slightly curved bar approximately between 4' and 8' in length that has cast iron or cement-filled plastic weights at either end, and used moved to increase strength in a great deal of movements. A free weight.
Bicep curls, benchpresses, militar presses, tricep curls or any other two handed movement where both arms move in the same direction.
by Gumba Gumba April 10, 2004
34 21
 
3.
A double ended butt plug
I shoved the barbell in my cats balloon knot while anal grease gushed everywhere. All the while the cat was using my coin purse as a scratching post. It was the best thing since sliced bread.
by DShannon July 21, 2008
22 30