Referring to a broad sense of the term awesome or amazing. Roseberries is used primarily as a noun, mainly in reference to Sex, Drugs, and Rock 'n' Roll. Usually used in exclamation and interchangeable with the term tits, ass, rad, sick, dope, chronic, etc.
EX. Sex
Look at those roseberries!
Damn she's got the nicest roseberries I've seen in a minute!
EX. Drugs
These are the best roseberries I've ever seen.. so many trichomes!
Rosemerline is the most beautiful and caring people you will ever meet. They are intelligent and fast thinkers. They have the shape of a coke bottle. Any man with an Rosemerline will be the most happiest person on earth because they will have you going crazy.