Barnacle!

Scenario 1
Me : "Afzal, make sure you put your books on the table!"
Son: "Oh Barnacle!"

Scenario 2
Me: "Afzal, go and bathe."
Son: "What a Barnacle!"


Oh what the thing is this Barnacle! It sounded like some bad word, and I knew where the son got it from. Spongebob Squarepants! That yellowish mustard sponge from Bikini Bottom. And I really doubt that Afzal knew what it meant but he used the expression quite convincingly. And here's the meaning of Barnacle from Merriam-Webster:

also called Cirripede , any of a majority of the 1,000 species of marine crustaceans of the subclass Cirripedia. Adults of cirripedes other than barnacles are internal parasites of crabs, jellyfish, starfish, and some other marine invertebrates. They have no popular name. As adults, typical barnacles are covered with calcareous plates and are cemented, head down, to rocks, pilings, ships' hulls, …

Hmm, by saying that, it means "What a parasite!", thus associating me with the Adult Cirripede - an internal parasite. Personally, it's does not sound too harmful but I think he should be made known of what it could mean or lead to. Should I wait till he is slightly older to explain...any comments?