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1.
Waking up early on thanksgiving morning, taking a large amount of pre-workout supplement and hitting the gym for a solid two hours. Particularly smashing large muscle groups such as chest back and legs. This session is then followed by eating as much thanksgiving food as possible for the rest of the day, thereby bulking like a boss. Hence the term, bulksgiving.
"Dude wake up, it's bulksgiving"

"Oh hell yeah, I'm going to lift and eat so much my colon blows out"
by Chocochase November 14, 2013