an alternative to the abbreviation "SMH" (meaning "shaking my head") SMJ is an abbreviation for Shaking My Junk. One can also SMJ at - something in need of a junk shaking.
Some people just don't know how to drive in the snow. SMJ
My boss wouldn't let me leave early. SMJ at my boss.
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Used as an alternative to the abbreviation, SMH (shaking my head), SMJ is "shaking my junk"
People that leave the cap off of the toothpaste really annoy me.
I know...SMJ.