A delicious "O" causing hard cock.
Muffy: Shazaaaam...Dat Pillar O Strength is just what the doctor ordered!!

Mike: Did you take your vities today?

Muffy: Awwww Mike, a Tbsp or two of the liquid variety would be purrrrfect.

Mike: Naughty
by mmylkmk August 3, 2009
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The feeling of invincibility and burst of physical power during an orgasm.
"I felt like the Hulk last night during sex; my O-strength was awesome."

"I accidently bruised my girlfriend's hips with my O-strength when I was gripping her last night."
by cum-strength June 6, 2012
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