Letters...
S-Line - Ample breasts and buttocks when viewed from the side
S-Line (second use) - Side view: forehead to bridge of nose to tip of nose
V-Line - A slim and oval face narrowing towards the chin
V-Line (second use) - The line in-between the breasts
W-Line - Breasts viewed from the front
X-Line - Long legs and arms connected by a narrow waist
U-Line - Exposed lower back in low cut clothing
M-Line - A "six pack" of abdominal muscles on men
D-Line - A pregnant (or pregnant-appearing) abdomen
B-Line - Big breasts, big abdomen
O-Line - Generalized obesity
Numbers...
8 Line - S-line married to a tiny waist, a shape sometimes mistakenly referred to as the X-line described above
1/8 Line - More accurately, "8 Deung-Shin," which indicates a face so small that it accounts for only 1/8 of the body
Objects...
According to the Korean Agency for Technology and Standards:
Beer Bottle Line - Narrow, dropped shoulders and overall flab
Jar Line - Loss of a well-defined waist
Food...
While not exactly a "line," food terms are being used in similar ways:
Egg line - Oval-shaped face that is not quite as sharp at the chin as the V-line described above
Honey thighs - Immaculate, smooth skin over the female thigh (or you might say the opposite of "cottage cheese")
Chocolate abs - A "chiseled" abdomen, similar to the M-line described above
With More Sure To Come...
Here are a few we've encountered that haven't yet caught on:
Y-Line - Giant breasts, rest of the body tiny (think overdone implants)
Zero-Line - Stick-thin head to toe (think anorexia)
And here are two new ones that we just thought up:
US-Line - Fuller female curves so popular in the United States
I-Line - Contours around the eyes, not just the crease (also, eyeline)