I saw Mommy kissin' Santa Claus 
underneath the mistletoe last night.
She didn't see me creep
down the stairs to have a peep;
She thought that I was tucked up
in my bedroom fast asleep.
Then, I saw Mommy tickle Santa Claus
underneath his beard so snowy white;
Oh, what a laugh it would have been
If Daddy had only seen
Mommy kissin' Santa Claus last night.    
We know a secret, we got a little secret,  
yeah, yeah, nah nah nah!
< instrumental break > 
  
Then, I saw Mommy tickle Santa Claus
underneath his beard so snowy white;
Oh, what a laugh it would have been
If Daddy had only seen
Mommy kissin' Santa Claus last night.     
  
Words and Music by  
Johnny Marks , 1949