look up any word, like lemonparty:
 
1.
to masturbate.

Can be used as a noun or verb.

Based on the results from the healthystrokes.com survey which reports the average man masturbates 7.2 times per week, or just about one-a-day.
"Sorry I took so long in the shower, I had to do my one-a-day"

"I just one-a-dayed all over the keyboard, anyone know how to clean that up?"

Jack: "Hey dude, why are you so whiny today?"
Jim: "I know, I'm so stressed out"
Jack: "Did you one-a-day yet?"
Jim: "Not yet! BRB ;)"
by reddan69 January 21, 2012
 
2.
A beneficial defecation regimen.
It never fails, when I travel my vitamin (one-a-day) routine is impeded.
by machBailz May 04, 2007