Shemar Moore engaged in some all-American guy fun -- flashing his sexy, rippling muscles on South Beach ... just long enough to get CRUSHED into the sand by another dude.
The "Criminal Minds" star kicked off his holiday early -- chilling with his cousin, who is such a MASSIVE slab o' man ... he tossed 6'1" Shemar around like a rag doll. A stupidly chiseled rag doll, but still ...
Someone's gonna be red, white, and bruised for the 4th of July.
See also
Tim McGraw -- I Like It, I Love It, I Want Some More of It! (PHOTOS)
Robert De Niro & Zac Efron -- Meet the Pecs
Ryan Kwanten -- Take a Bite Out of This!
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