Who's the smallest wife??
Micro-wife.
This joke is playing on words, you dumb-dumb. It uses "micro" which means small, and mashes it up with "wife" to get "micro-wife". Get it? It's funny because it sounds like a tiny spouse, and your IQ is also tiny!
Gwen
GREAT PUN!!!!!!!!!! XDDDDDDDDDDDDDDDDDDDDDDDDDDD LOLOLOLLL