discription of a man whom god has not graced with the good looks of Jared Leto but has given the bank balance of Bill Gates, thus making the aforementioned individual attractive.
"That Roman Abramovich, Chelsea football club owner, jeeze, what he lacks in looks he makes up for in bucks."
"Oh good Lord, that Bill Gates, founder of Microsoft, what he lacks in looks he makes up for in bucks, kinda."
Buck up means to basically grin and bear it, kinda like sayin "get over it" only more nicely. It's especially used in the south and often in small towns.
Mark was complainin about the rain ruinin the huntin trip and his dad said "it'll be ok, just buck up"