1) An
imaginary animal, probably resembling a weasel, but more cartoon like. They are said to be mischievous and charming creatures, which allows them to commit atrocities without
repercussions.
2) An
inanimate object or being on which to blame mishaps, or attribute misfortune
3) A person who takes advantage of, lies to, or in some way wrongs another, but has the charm and interpersonal skills to avoid punishment or retribution.
"He's as cunning as a dweezil"
"That darn dweezil
emptied my bank account again, but God
love him, he did it for those
starving children in Africa."
"Socks are not lost in the dryer, dweezils, who live in dryer vents eat them and the dryer is blamed."