whiz-race

The impromptu "time-contest" that you are forced to wage with an approaching vehicle when you step off da sidewalk to pee and there is little concealing "cover"; you therefore have to actively "hurry your bladder" in a desperate effort to "drain yer radiator" quickly enough to "beat da clock" --- i.e., to finish "whizzing" and get your pants zipped back up before the "whizzing" car gets close enough for its occupants to catch sight of you wif yer tallywacker out.

I try to always choose a thickly-vegetated spot in which to take a leak when I'm out walking along country lanes, but occasionally there is such a lengthy stretch of sparse bush-growth that I am unable to "hold it" long enough to eventually reach denser roadside-foliage; I therefore have to "hold a whiz-race" if I hear one or more vehicles approaching in the distance.