morning glory
noun
1
an erection upon waking up in the morning. Rhyming slang for COREY (the penis), formed from the name of a popular garden flower (Ipomoea violacea) UK, 1992.
2
an act of sexual intercourse in the morning AUSTRALIA, 1960.
3
a drug addict's first injection of the morning US, 1959.
4
in horse racing, a horse that runs well in early morning workouts but not during races US, 1904