Teacher: "Do you work."
Pupil: "Yeah, might do!"

Shortly followed by a swift first finger pointing gesture.
by WGSB November 16, 2004
A might do is someone who says whilst your both high “a might do” when you ask them if they have got any filters so you can roll a cig.
“Have you got any filters” I said
Oliver said “a might do”
by Stayout February 22, 2019