Simply so, what is a roll up slang?
to arrive. See more words with the same meaning: to go, leave, exit.
Likewise, what does bare mean in British slang? It means "a lot of", as in "there's bare people here", and is the classic concealing reversal of the accepted meaning that you also find in wicked, bad and cool. Victorian criminals did essentially the same with back slang, reversing words so that boy became yob and so on.
Similarly, you may ask, what does Peng mean in UK?
Peng: good, or (of a person) attractive. "She's a peng ting [thing]." Other British slang words for attractive include fit, lush, a sort, piff, buff, leng.
What's the difference between Peng and Leng?
It's used for emphasis. For example, if we're talking Mad Men here, Betty Draper is fit…but Joan Holloway is PENG. For extra points, add "a leng" on the end. "She is looking PENG A LENG."
