When the person you are conversing with stop replying mid discussion. It is an acronym for 'Blood Out Of A Stone, Mate', suggesting that getting a reply off this person can be similar to squeezing blood out of cold, dry stone.
Andrew: I made three thousand last week on the markets
Kirk: Awesome bro, how did you manage that
Andrew: Got lucky with investments, also starting having sex with my neighbor
Kirk: Awesome, how was she
Andrew: Amazing mate, you'll never guess what she did to my anus!

...

46 minutes later..

Andrew: Booasm.
作者 bamberclart3000 2012年1月09日

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