Was a little false

• Told a little lie
• Lied in a small way
• Told a tale
• Crossed one's fingers, perhaps
• Wasn't exactly truthful

WordNet Word definitions in WordNet
v. tell a relatively insignificant lie; "Fibbing is not acceptable, even if you don't call it lying" [also: fibbing , fibbed ]

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.]