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(KSDK) – How do you fit words such as spanx, gerbil and nip slip into everyday conversation?

Ask Jimmy Fallon or Ricky Gervais.

The two men went head-to-head in a game of word sneak on "The Tonight Show starring Jimmy Fallon" Monday night.

The men had to slip selected words into casual conversation, and the skit became so funny that both men could barely hold it together in laughing.

Watch the entire skit below.

Tuesday night, Fallon welcomes Jonah Hill and Chicago Mayor Rahm Emanuel.

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