The
act of showing
too much interest in another person making you appear
desperate and less desirable to them. The term "Quick Sanding" is referring to if you were standing in quick-sand trying to get out- the harder you try the quicker you will sink.
Her: "I tried calling him, texting him, even went to dinner with his mom. Then I tried to add him on Facebook. I still
haven't got any response. I know....I will try texting him again!"
Person listening to her: "You are Quick Sanding so bad right now-
Please just
stop!"