To describe a person with really small eyes (especially asians) that is either a slit or looks like a vagina. Can be another way of describing something really small.
John: Look at his eyes, how the hell is he gonna see anything through that line?
Bob: Now that's a lang cheng
John: I reckon ay
Bob: Now that's a lang cheng
John: I reckon ay
by wuming June 7, 2007