There's this from a Whitney Balliett interview of Jimmy Rowles. It appears on page 301 of his collection "American Musicians II" and probably appeared elsewhere earlier.
Oh well. The clip I tried to paste in wasn't accepted. I'll have to type it...
"Lester was the coolest man I ever met. He had his own language. He'd turn to me on the bandstand and say, 'Startled doe. Two o'clock,' which meant if you looked into the audience at where two o'clock was you'd see this pretty chick with big eyes. 'Bob Crosby's in the house' meant a cop had just come in, and 'Bing and Bob' meant the fuzz were all over the place."