Blazen tot honderd (1998) has a short pee scene
any other movies?

Opale Plage (2010) has a pee scene

Aglaja (2012) [Hungary] has also a pee scene

Daimi (short film) has an awesome pee scene

any other movies with pee/toilet scenes?

Le Acrobate (1997) has a very good toilet scene

Nena (1997) has a pee scene (outdoor/waist up)
any other movies?

Santi Ahumada has an outdoor pee scene in De jueves a domingo a/k/a Thursday Till Sunday.

some movies with toilet scene:

Le tombeau des filles (2011) (Switzerland)
Ela (2007) Short
Despierta (2007) Cuba

Some movies that I have found here have a toilet/pee scene:

Dear.Lemon.Lima
Corpo Celeste 2011
Hayat var
De Fuik (2008)

probably there are more, but nobody post it, so if you find one please post here