der Kracher
hit
Colloquial for a big success, a particularly exciting event, or a spectacular product.
Das neue Album der Band ist ein absoluter Kracher.
The band's new album is an absolute hit.

hit / firecracker
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hit
Colloquial for a big success, a particularly exciting event, or a spectacular product.
Das neue Album der Band ist ein absoluter Kracher.
The band's new album is an absolute hit.

'Der Kracher' comes from the verb 'krachen', which means 'to make a loud bang'. This idea of a loud, sudden impact appears in all its meanings: the loud firework, the smashing success, the loud joke, or the explosive sports event.
Das laute Krachen der Feuerwerkskörper erschreckte den Hund.
The loud banging of the fireworks frightened the dog.
With the exception of the meaning 'firework', 'Kracher' is used almost exclusively in informal colloquial language. In formal or written contexts, the word often sounds too casual.
Sein letzter Film war ein echter Kracher an den Kinokassen.
His last film was a real box-office hit.
Which meaning is intended is almost always clear from context. If it's about New Year's Eve, a firework is meant. In a sports context, it means a top match, and in a conversation about a joke, it refers to a funny punchline.
Das Derby zwischen den beiden Stadtrivalen ist der Kracher des Monats.
The derby between the two city rivals is the top match of the month.
In the meaning of 'success' or 'highlight', 'Kracher' is often intensified with adjectives like 'echt' (real), 'absolut' (absolute), or 'richtig' (real/proper) to emphasize the special quality.
Die Party gestern Abend war ein richtiger Kracher!
The party last night was a real hit!
When talking about fireworks, the typical verbs are 'Kracher zünden' (to set off firecrackers), 'Kracher anzünden' (to light firecrackers), or 'Kracher werfen' (to throw firecrackers).
Es ist verboten, außerhalb von Silvester Kracher zu zünden.
It is forbidden to set off firecrackers outside of New Year's Eve.
hammer
'der Hammer' and 'der Kracher' are both colloquial words for something that really stands out or excites people. 'der Hammer' is very broad and can be meant positively, negatively, or simply with surprise. 'der Kracher' is especially suitable for a big success, an exciting event, a great product, a top match, or also a very funny joke. Learners may confuse the words because both express excitement. As a guide: 'Hammer' is the general strong reaction; 'Kracher' sounds more like show, success, excitement, or laughter.

Morgen wird das Spiel gegen den Tabellenführer ein echter Kracher.
Tomorrow's game against the league leaders will be a real top match.
In der Küche habt ihr gestern ein Dessert gemacht, das wirklich der Hammer war.
Yesterday in the kitchen, you made a dessert that was really amazing.