in the sense of an EMOTICON.
2. When using it as a plural (ie. shakeS fist) or as an ACTION, then the proper usage would be "shakes fist" as two SEPERATE words.
2. :shakes fist at (place name here):
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from firstname.lastname@example.org. We'll never spam you.