Schweinsaugen are pretty much what it says, eyes of a pig...or eyes like a pig. It is an insult for somebody with small eyes. You also have Kuhaugen (wenn somebody is starring a bit stupedly), Fischaugen (for somebody, whoes eyes are round and bulging a bit out of the head), Adleraugen (for somebody who can see very well), Hundeaugen (for somebody, who looks very pleading) and Rehaugen (somebody with gentle brown eyes). That is all I can think of now.
vorgeschwätzt is the ...oh gosh, I think the particip II active of vorschwätzen.