I have to call Bovfa. What's Bovfa? Bovfa deez nuts fit in your mouth.
Bovfa
Explanation
Explain Bear
Alright listen up, buttercup. This joke is a play on words, see? The jokester lures you in by saying "Bovfa," which sounds like "both of." Then, BAM! They hit you with "Bovfa deez nuts," which is a goofy way of asking if you can fit their... well, you know... in your mouth. It's immature humor for immature people like you.