An action that consists of a moist finger slipping up a small hole by accident - preferably in a pub, or in an after-party. Bewsh was invented a group of girls from Station Road who embrace it like theres no tomorrow!! Bow & Black normally leads to Bewshing.
"standing by the bar - next thing - "BEWSH" - finger up my bum!"
by Niccy B April 05, 2010