Your
sister asks to borrow your sweater. You know she will never return it. You simply respond with the phrase "
go buy it." meaning hell no!
Someone comes up to you and tells you that you did a
poor parking job...you can simply reply with the phrase "
go buy it." Meaning
F-off or F-You.
A co-worker is telling everyone in the office how he/she received the best overall evaluation score. You are annoyed at their tone of voice or insinuation that you aren’t as good. You can simply say "go buy it."