Sex on the stairwell

1. Noun, a cocktail originating in Scotland.

Defined as a mixture of a lower percentage lager or beer, e.g. Tennants, with it's higher percentage equivalent, e.g. Super Tennants, in order to achieve the desired alcoholic percentage.

1. I'll have Sex on the stairwell and a packet of crisps

2. "I had Sex on the stairwell last night, and now I keep puking on the carpet."