noun
chipped ice; ice chips
Refers to ice that has been crushed or chipped into small pieces, often used in drinks or desserts.
夏はぶっかき氷を入れた麦茶がおいしい。
In summer, barley tea with chipped ice is delicious.
Rarely used kanji form.
かき氷 is shaved ice, a dessert with syrup, while ぶっかき氷 is simply chipped or crushed ice, not necessarily sweetened.
From ぶっかく (to smash, crush) + 氷 (ice). The exact derivation of ぶっかく is uncertain, but it is likely a colloquial or emphatic form related to 打っ欠く (to break, chip).