When one notices an attractive person (usually across a room or street), they may stare intently at the other
party until said
party looks over at them, at which time the head of the glance-flirt initiator
will be turned away. At regular intervals, the two must now look up at each other and make eye contact for a brief amount of time, then look away again.
This is an acceptable form of flirting.
I was at the grocery store
today. There was this really hot girl there, and I was glance-
flirting with her
like the whole time I was there.