Don't louse it up

Mother is talking to her daughter about a man.

“ Look!, he is a nice boy! He makes a nice living. And besides you don’t have that many chance! You can not afford to be choosey! So for goodness sake, don’t louse it up!

Don’t let him know you’re more intelligent than he is, so don’t talk too much! And don’t show him that you’re a better athlete by beating him at bowling!

What I’m trying to tell you is: Don’t let him know you’re superior to him!
There ‘s plenty of time for that after you’re married. “