synnonoms include:
confuse, miscalculate,
misconstrue, misinterpret, misjudge, misread, overestimate, overlook,
underestimate, addle, blunder, botch, bungle, confound, err, fail, goof, jumble, lapse, misapprehend, misconceive, miscount, miss, omit, slip, snarl, tangle, be
off the mark, be wrong, deceive oneself, get wrong, have wrong impression, make a mess, misdeem, misknow, miss the boat, put foot in, slip up, AND take for
if you didn't read all of them read it because my hands hurt from typing
slang: idk
meaning: 1. used to say that one does not have the information someone is asking for.
2. used to express disagreement, doubt, or uncertainty.