After the meeting, the sales team celebrated closing the deal with enthusiastic backslapping and cheers.

backslapping 是由 back（背部）和 slap（拍打）组成的复合词，加上 -ing 后缀构成动名词形式。字面意思是"拍打背部"，引申为"热情祝贺"或"互相庆贺"的动作，通常指通过肢体接触（如击掌、拍背）来表达兴奋和祝贺。