This term refers to a beer being drank on a porch or front lawn of someones house in a social setting during the day.
It was created March 29, 2008 on the University of Minnesota-Twin Cities Campus.
"Why is Marcus skateboarding in a chicken suit?"
"I think he's had too many daybeers"
"It's two o'clock. Lets go on the porch and have a daybeer and a smoke."