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1.
A muscle hamster is a small person who joins the gym in order to try and bulk up, hoping it will make up for their size
Tony: Ha, have you seen ollie joined the gym

Ally: Yeah hes such a little muscle hamster
by Kaiiizr February 13, 2010
 
2.
To be swollen; to be fucking jacked. Gaining so much mass that girls offer ass. The definition of having guns for buns. Flex for sex? You don't even need to flex to get sex. Remember, Muscles, never steamers.
Dude have you seen that kid AAJ? Kids a fucking Muscle Hamster.

That Townie murph is the definition of a Muscle Hamster
by GainMassForAss November 08, 2012