Complain all you want about “that’s sus” and “no cap,” but slang from our teen days was just as, as the kids say, cringe. Sure, they may remain joyful little linguistic time capsules of our youth, but do you really think anyone who didn’t grow up with 00s era Alicia Keys and Usher would have the same appreciation for the term “my boo”? No! This is, after all, how teen slang works. It helps young adults form their own identity, incorporating bits…