It's probably the national squad. The team mascotte is a lion. There's also a song that goes "Hup Holland hup, laat de Leeuw niet in zijn Hempie staan, want een leeuw op voetbalschoenen kan de hele wereld aan".

loosely translated as "Go Holland go, support the lion, cause the football-lion can handle the entire world", it sounds even more corny in english... :embarass:

 

It is corny