mock turtleneck untucked?

I picked up an inexpensive mock turtleneck that I really like the color of. My question is, can I wear this untucked? It's somewhat long, and while too thin to be a sweater it has that sort of sweatery feel. So untucked with jeans? How about with slacks, or is that even more of a stretch? I ask because my body shape is such that I look terrible with tucked shirts.

Don't have access to a camera right now, I just wanted to make sure I wasn't violating some inviolate rule of fashion; as long as you tell me that occasionally you can wear a mock turtleneck untucked with slacks I will be happy.

Keep in mind I only care because I want to look good to the opposite sex, I personally wouldn't stress about it unless I thought it might disadvantage me there.