Squggle is a "squishy snuggle".
When you're with your partner and are having snuggle time, but the moment develops into something more erotic and gets "squishy"(wet, sloppy, macaroni in a pot type stuff)
My girlcame over for supper and we squggled on the couch afterwards.
Someone who is very comfortable with physical affection (think Abby Scuito from NCIS) and is not afraid to be bold in initiating it, especially with their significant other.