Living under a rock

To say someone is 'living under a rock' means that they have not kept up with current events, trends or beliefs because they have kept themselves isolated or simply don't care. It is pejorative.

Example:
-Can you believe he still thinks it's okay to beat your children?
-What rock has he been living under?

Tightwad

A 'tightwad' is a person who likes to hold on to their money and not spend it. The term is not a compliment, but is pejorative, and the person is often considered to be 'cheap.'

Example:
-My favorite kids' store is Gymboree. Where do you get your girls' clothes?
-I love Gymboree, too, but my husband is a total tightwad.

Soccer mom

A 'soccer mom' is a mom who lives in the suburbs, stays at home (doesn't work outside the home), drives a minivan and takes her kids to soccer practice, piano lessons or Scouts -- any kind of after school activity.

The term is slightly pejorative, as it implies the mom doesn't really do anything important -- she just drives her kids around. Still, there are enough soccer moms around that the term was coined.

Example:
-I'm such the little soccer mom!
-Ha ha! Me, too!