Crossed one's fingers, perhaps

• Told a tale
• Wasn't exactly truthful
• Lied in a small way
• Told a little lie
• Was a little false

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Fib \Fib\, v. i. [imp. & p. p. Fibbed ; p. pr. & vb. n. Fibbing .] To speak falsely. [Colloq.]

WordNet Word definitions in WordNet
See fib

Wiktionary Word definitions in Wiktionary
vb. (en-pastfib)