Dia duit Scott.
The phrase in Irish is 'Bí ullamh!'
Meaning: Be prepared.
http://www.daltai.com/cgi-sys/cgiwrap/daltai/discus/show.pl?tpc=12465&post=11286 (You may like to pronounce it 'bee ulav')
If you want a phrase in Irish it may be best to post the entire phrase to the board here and I'm sure many will help you out with it.
Slán go fóill.