My 20mo ds3 has a few words, most of them unintelligible. Mamma, dad, jees (juice), cake (!?), hank ooo (thank you, obviously) are the ones that we recognise most, although sometimes he'll throw us a curve ball (ice cream!) from nowhere, say it a few times, then never again.
Today, however, has been the learning curve from hell!! Firstly while watching Dora, when she says backpack, I repeated it to him, to which he replied 'pk'. No, ds3, it's backpack! He just kept repeating and repeating the wrong word. I tried bag, rucksack, just to get him to break the sound but nope. Ds1 walks into the room ready for school with his bag on his shoulder and ds3 points at him and shouts out 'pk'! 
Short time later, ds3 toddles through from the kitchen with a box of crackers in his hand and loudly shouts 'fuckers!' He's been repeating that one on and off all day now too!
So wibu to not leave the house for an undetermined period of time for fear that my one year old will disgrace me and make me look like World's Worst Mum!? (It goes without saying that he has heard neither of these words in this house, or anywhere else for that matter!)