The scrimmage "scrim" is what happens before the real game (dating) actually starts.
once you receive the girls number "scrims" go from unofficial to official. After official scrims and the actual relationship status changes you are no longer "scrimming."
"Lets go to the mall and scrim some baddies." which means going to holler at sexy girls at the mall
"Did you just say "Scrim?""
"Yea, now move your ass."
Scrims have also seen extensive use in theatre where they are often used for special effects. In theater a scrim can refer to any such thin screen and are made out of a wide variety of substances. The advantage of scrims is that with certain they can appear opaque to the audience until a quick change in stage lighting makes them almost fully transparent.