1
to grow senile;to be childish with age
最近、物忘れが激しくて。少しボケてきたのかな?
Could I be going soft in the head? I forget things so easily these days.
2
to be mentally slow;to be befuddled
3
to play stupid;to say something stupid (oft. on purpose; esp. as part of a comedic routine)
Other forms
惚ける 【ボケる】 · 耄ける 【ボケる】 (rarely used kanji form)