I assume BOLO means the same as APB, All Points Bulletin, but what do the letters stand for? Also, what does Tony mean when he say "on your six, boss"?

the clock is used to give direction in the military.....12 o'clock is straight ahead and 6 o"clock is behind

12 o'clock is ahead and six o;clock is behind 3 o'clock is to my right and 9o'clock is to my left

to complete the previous post.....So Tony has Gibbs' back...when he says "on your six, Boss"

Any shed light on the comment Gibbs made at the beginning "Did I have the fish or did I have the lasagna?" not clear on what he was referring to-Duckie/Vance/Gibbs standing next to the "Kelly".

BOLO is "be on the look out"

Ducky and Vance remark that Gibbs had only taken one vacation this year, he sailed the Gulf of Mexico and then bought a one-way ticket back. Gibbs says, "Did I have the fish or did I have the lasagna?" Gibbs was being sarcastic. He meant was, Vance & Ducky seemed to know so many details about his vacation, they probably knew what meal he had on the flight back.