surboum

From sur- +‎ boum where boum has the meaning of "party" and sur-; most probably derives from surprise-partie by apocope.

• IPA^(key): /syʁ.bum/

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surboum f (plural surboums)

1. (colloquial, dated) party

   Synonyms: boum, surprise-partie

   Hypernym: fête

   Tu vas à la surboum de Machin ?

   You going to what's-his-name's party?

The word is somewhat dated, fête or teuf being more contemporary.

• “surboum” in Dictionnaire français en ligne Larousse.
• “surboum” in Dictionnaire Le Robert.
• “surboum”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.