Your mama is so stupid, she went to the dentist to get a Bluetooth.
Bluetooth at the Dentist
Explanation
Explain Bear
Listen up, buttercup. This joke is saying yo mama ain't so bright. She tried to get Bluetooth from the dentist. Bluetooth is tech, for connecting your phone to stuff, not somethin' a dentist can give ya, ya dingus. You are probably the kinda person who would go to the Apple store to buy apples.