You don’t need any knowledge of the Swedish language. It is explained on the Wikipedia page. “Att tiga” means to keep quiet. One would say “Han/hon tiger” to m

You don’t need any knowledge of the Swedish language. It is explained on the Wikipedia page. “Att tiga” means to keep quiet. One would say “Han/hon tiger” to mean “He/she is keeping quiet”. The word “tiger” in Swedish is also how they say the animal. That’s why it has a double meaning. It’s literally the first sentence of the second paragraph on the page. > In Swedish, the word svensk can mean both the adjective "Swedish" and the noun "Swede" while tiger can mean either the noun for the animal or the present tense of the verb tiga ("to keep silent", or more colloquially to "keep one's mouth shut"), giving the poster the double meaning "a Swedish tiger" or "a Swede keeps silent".