It is a terrible curse to use it on people. The landlord is right. Lamb is worse than climbing the mountain. Climb, even quickly, for example, climb quickly. But when people fall to the ground injured or sick, it is bad enough. It is really derogatory to compare it to the "orchid" like a worm. Usually used for:
Order the others to go away.-LAN's on.
Order others to step aside-bury them.
Curse others.-dead blue street.
However, I seem to have never seen how to write LAN. I only know the fourth sound of the word "LAN" in Cantonese.