Genus snugus, species bugus. In the family of fine girls. A girl that loves to snuggle up to you in bed.

Though intended to mean 'comfortable,' looking deeper into the phrase makes anyone who says it sound like a retard. Bugs (insects) are exoskeleton based; they have rough, spiny, or hard shells, and implying that you are comfortable when being coated in spiny shells just seems straight up stupid.

When someone gets in a very confortable and safe position or place.
usually used to define in a funny way when the kid feels great laying in a bed to sleep.