boom phwooar Share definition Flag It's a secret word best friends use when they are over excited. - Also comes with a handshake :) Jen says: OMG i cant wait till holiday. Grace says: I know its going to be greattt. Both: Boom Phwooarr. (Y) boom phwooar by jnifr&acegrace. January 18, 2009 Get the boom phwooar mug.