When a couple (straight or gay) has a platonic "crush" on another couple, not sexual but idolizing them. Oftentimes, the "crushed upon" couple is older and has a little more life experience than the "crushing" couple. They are usually seen as mentors or the type of couple the "crushing" couple aspires to be.
"We went to dinner last night with Rebecca and Jon -- they are so cool and fun, I hope Kevin and I turn out just like them in 10 years!"

"OMG, Laney, you and Kevin have such a Couple Crush on Rebecca and Jon!"
by bonkk1 February 18, 2010
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