An exclamated expression used to comment on women’s breasts. (Ace meaning 'excellent,' racking meaning 'breasts'). Can also be used, oddly enough, for anything that is good. This expression developed in Oyster Bay.
'Dude, check out that acerack on that girl!'
'Dude, this band is surprisingly acerack.'
'My hat is like, totally acerack.'
'Dude, this band is surprisingly acerack.'
'My hat is like, totally acerack.'
by shmack August 25, 2009