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Puerto Rican slang (and also used in some other Caribbean islands). Usually, it means to be head over heels in love. It can also be used as to describe someone who is very excited about something. In Mexico and Central America, it means to be very pleased about something.
(culeco is masculine, culeca is feminine)
When he asked her to be her girlfriend, she said yes and he was culeco.
by boricua-morena November 15, 2010