Mistress of the Lash. A domineering female, such as a boss, teacher, wife, or other female who demands obedience and adherence to impossible schedules and tasks.
I can't come over to watch the game Sunday; the MOTL wants me to work all weekend.
basically, it's a reference to a May-December cougar romance. A difference between generations. A Mrs. Robinson affair.
Steve and Cyndi are going out together. Steve makes Cyndi feel like she's 28 again. Steve is 28. Cyndi is 54. It's a clear case of a "her Motown, you Motley Crue" romance.
basically, it's another reference to a May-December romance where the woman is quite a bit older than the man. This is also referred to a "Mrs. Robinson" love affair, because of the movie "The Graduate" where Dustin Hoffman's character falls in love with his girlfriend's mother.