"fly"(insect) means the same as "fly" that has many meanings (for example navigate, to be on the wing and so on) . Also instead of bly or fly it can be used zee or zeez (sound that resembles buzzing, huming etc.)
“You sure, you seen a BLY undercover around the corner, before you came over?”
“You better not be messing around, I got to get a night cap, before two!”
