T.Y.D.S.I.M.W.M.H.B.B.I.U.I is from the famous song Washing Machine Heart by Mitski, For example the lyrics “Toss your dirty shoes in my Washing Machine Heart. Baby, Bang it up inside.”
I love you so much babe, I don't know how to tell you but I killed your dog in my bathroom.
John's gf: Hey where's my dog?
John: i.l.y.s.m.b.i.d.k.h.t.t.y.b.i.k.y.d.l.m.b.
John's gf: What?
John: I love you so much babe, I don't know how to tell you but I killed your dog in my bathroom.
John's gf: WTF JOHN!!!!!