Is this grammatically correct? What does it mean? Any possible rephrasing? I thought you guys didn’t have a problem buying expensive hairs for your girlfriends

Yes, the sentence is grammatically correct. It suggests that the speaker believed (or had the impression) that the people they are addressing (likely friends or acquaintances) were okay with spending a lot of money on hair products or hair extensions for their girlfriends. Possible rephrasing could include: 1. "I was under the impression that you all didn't mind spending a lot on hair products for your girlfriends." 2. "I thought you guys were fine with buying pricey hairstyles for your girlfriends." 3. "I believed you all had no issue with purchasing expensive hair for your girlfriends." Each of these alternatives conveys a similar meaning while varying the wording slightly.