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To judge or criticize someone. Why are you bagging on me? I didn't do anything wrong! If my friends see me with this stupid haircut, they'll bag on me for months!
Packing one's own food (e.g., in a brown paper bag), especially lunch, usually for work or school. Ever since I started brown-bagging it, I've been eating much healthier foods than when I used to go out for lunch.
bag on someone
Sl. to criticize someone. Stop bagging on me! I'm tired of all your complaining. If you are going to bag on everyone all the time, I don't want to hear about it.