bulging or protruding (often used colloquially to refer to a male's genitals bulging under clothing).
ジーンズの前がもっこりしていて恥ずかしい。
There's a bulge at the front of my jeans—it's embarrassing.
ポケットに本を入れていたので、前がもっこりして見えた。
Because I had books in my pocket, there was a visible bulge at the front.