A random one-off night of rough, drunken sex with a stranger, often outside in an alley or car park, which results in:
1. (for women) - you falling pregnant
2. (for men)- you being presented with a baby 9 months later; you being confronted by a teenager 18 years later claiming to be your offspring
3. (for both men and women)- you contracting one or more STDs
4. all of the above
Hungover university student 1: "Jesus I feel rough - think I ended up having council sex outside the union..."
Hungover university student 2: "I'd get myself down the family planning clinic if I was you."