a vulgar way to say 'to take a big risk / gamble' [colloquial]
Definitions (粵典–words.hk)
語句、粗俗
歇後語：「博到盡」；因為鳩毛，即係男性嘅陰毛其實好短，對比起放紙鷂用嘅繩嘅長度爭好遠，如果要咁做就要不斷一條駁一條咁駁長，所以係「駁到盡」，而駁同博同音，食字就變「博到盡」 (a sandwich pun) to gamble everything; to go all in; literally: flying a kite with pubic hair