私は料理がからっ下手で、目玉焼きすら焦がしてしまう。
I'm utterly hopeless at cooking; I even burn fried eggs.
He's a terrible singer, but for some reason he's popular.
から下手 is a similar emphatic form, but からっ下手 is even more colloquial and intense due to the geminated っ.
Standard kanji spelling for this emphatic expression.
Alternate kanji spelling using 空 for 'empty'; less common but attested.
Formed from the prefix からっ (emphatic, from 空 meaning 'empty') attached to 下手 (へた, 'unskillful'), with the reading へた changing to ぺた for phonetic emphasis. The exact derivation is uncertain, but it likely originated as a colloquial intensifier.