Any item or items used in one's yard, in abundance, for ornamental and decorative purposes that would be considered trashy by most peoples standards. It is a combination of the words yard and garbage. It is not to be confused with items often found in a hoarder's yard, as that is simply trash.
Her yard would look so much better if she didn't have so much yarbage. Who decorates their yard with flamingos and gnomes anyway?
The fantasy football yardage points earned during garbage time.
Lookin' to get some serious yarbage points today!