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Hitting someone hard on the arm for the amount of years they are( and an extra one for good luck( extra hard))
I hear it toms birthday, let's give him birthday bumps
by @welshdragon83 June 23, 2018
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a historical birthday tradition where friends of the birthdayer lift them by their arms and legs and swing for the amount of years they are turning.
Bob: Hey jim heard its patti birthday celebrations later, we should give her the birthday bumps!
Jim: right on man - thats the only way to celebrate turning 47!!!
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by danesworld____ March 09, 2018
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