Person 1: What a cute dog! What breed is it?
Person 2 (as dog is barking incessantly): It's a barkapoo.
Person 1: LOL, no really!
Person 2: It's a barkapoo. Haven't you heard it barking the past half hour? When we got it we thought it was a yorkiepoo but turns out it's a barkapoo.
It comes from the two words "Baka" and "deredere". Baka and deredere is in Japanese. Baka means idiot and deredere means "lovey dovey". So bakadere basically a clumsy and idiotic person, who also is sweet and kind
Bakadere is mostly used by people who watch anime, or read manga