Sit:
Press Down.

Lie down:
While sitting, press Down.

Shake body:
Press Left, Right, Left.

Beg 1:
Press Left, Right, Up.

Beg 2:
Press Right, Down, Up.

Beg 3:
Press Left, Up, Down.

Beg 4:
Press Left, Left, Right.

Beg 5:
Press Left, Down, Up.

Fart or poop:
Press Left, Right, Down.

Pee left:
Press Left, Down, Left.

Pee right:
Press Right, Down, Right

Thanks to Revolution readers GeraldM, and Tozzlor!