An abbreviation for "be on the lookout," used when one needs to watch for something or someone. BOLO for my email! It will have all the instructions you need for the project.
be on the look out
and BOLO
phr. & comp. abb. establish and maintain surveillance [for someone]. (A police notation.) BOLO for a 65-year-old woman with tattoos on her upper arms. We’ll be on the look out for your stolen car.