The giant weight that Strong Bad drops on Homsar in StrongBadEmail/Homsar. "Lourde" means "heavy" in French, so it's a bit redundant.

A Heavy Lourde is also dropped on Strong Sad (as Strong Bad's stunt double) in the StrongBadEmail/stunt double. - Shenlon

Also, on the Main Pages/Homsar MainPage, Homsar gets hit by a Heavy Lourde when 'Games' is moused over.

Would not bilingual labelling in French and English be a rather Canadian thing to do?

I'm pretty sure it's supposed to be perceived as "load". The fact that it's French for "heavy" is just a little humor for those who know French.