idiot; shitbrain
Strongly derogatory insult; roughly equivalent to calling someone a stupid fool or shithead. Used in very informal, angry, or contemptuous speech.
Don't listen to what that idiot says.
You really are a shitbrain.
Katakana spelling used for emphasis or in informal writing.
Rare kanji spelling; the first character is a strong vulgar kanji.
Rare kanji spelling; the second character is an uncommon ateji.
Compound of くそ (kuso, 'shit') and たわけ (tawake, 'fool, nonsense'). The exact derivation of たわけ is uncertain, but it is a native Japanese word for foolishness.