I'm not JG, so I wasn't there at the time, but Kallie told me all about it later. Jason apparently has a scab on his foot in the shape of an eye. As it's on his foot, it looks up. So he jokingly called it his spiritual eye, looking up to the heavens.
Rebecca looked at him, slightly horrified and said, "I hope you don't stand with your spiritual eye around girls wearing skirts!" which nearly killed Veng with laughter.
As Kal said, "It would be funny coming from you or me, but it was 10 times better coming from Rebecca!"