The act of lying flat on the ground with arms by your sides, when either ordered to do so or as an agreed forfeit in a drinking game.
Originally started in Bristol after a viral video contained original footage of the Jess Neville assumption.
The official call is: "assume the jess neville!" at which point, unless one person has been targeted, everyone must assume the aforementioned position.
Assuming the jess neville can also be used as a punishment in drinking games until all but the winner has assumed the position.