A slugface is a person who’s face is sluggish and looks like a slug or bug

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.

Richard Booth

The equivalent to a lady tea bagging. When a snail trail is applied directly to another's face, or the vaginal discharge commonly associated with being aroused is smeared onto someone's face through contact with the vagina.