gall - Dictionary definition and meaning for word gall
A slap on his 'Gall'(cheek) completely exasperated him.
gall - an organ named gall bladder produces a liquid called bile, which is BITTER
Gallbladder -> GALL. Note that many of the words with roots from body organs mean irritable or anger. Examples: splenetic, spleen, bilious, atrabilious, dyspeptic, livery, gall, and liverish.
Gall=remember Galls in "Asterix & Obelix" they used to slap the romans ,,, as the Romans always annoyed them :)