When you chest bump your girlfriend instead of hug her on a regular day basis
"Dude it's bump day!"
by Bumpday February 1, 2015
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The act of playing and enjoying 4 new bumping songs 4 days a week.

see bump4days.com
I'm hella bored right about now, thank god i can bump for days at bump4days.com.
by Sam BayBay August 16, 2011
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Bump Day is an online event by What to Expect that takes place annually on the third Wednesday of July to highlight disparities and inequities in maternal health care across the United States.
"This year, to participate in Bump Day (#BumpDay) I'm sharing a study that found 1 in 4 moms feel ignored or dismissed by their health care provider."
by Mark Syl July 18, 2022
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