1) Having to do with the underwear of a female entering the vaginal slit to such an extent that retrieval is a near impossibility. 2) Female version of a melvin. 3) In certain instances it is possible for a man to experience this version of a melvin, but only when a mangina is present
See also: Ninja Boot, Vadgie, Fwedgie, Melvin.
1) After walking around the mall all day and spending her husbands hard-earned money, Sally had a monster vagelvin.
2) After realizing that I had pleasured his sister on his bed, Johnny had one hell of a vagelvin.