Noun, Suru verb, Intransitive verb
erection when waking in the morning; nocturnal penile tumescence; morning glory; morning wood
朝立ちやしょんべんまでの命かな。A morning erection: Will it last only until I take a leak? early morning departure
Also written 朝勃ち【あさだち】、朝起ち【あさだち】