1. Vagina (derogatory)
2. A messy sexual accident, such as becoming 'over-excited'.
3. The aftermath. (S'allamsayin')
NB not to be confused with Soggy Sesh, which is either the appreciation of a Soggy Mess or the act of making a Soggy Mess.
1. Oh, it's a bit of a Soggy Mess./ Her vagina is such a Soggy Mess.
2. Don't make a Soggy Mess./ Oh shite, I made a Soggy Mess.
3. We left such a Soggy Mess in the backseat of her car.