(according to merriam-webster.com)
1. revealing or marked by a smug, ingratiating, or false earnestness <a tone of smarmy self-satisfaction - New Yorker>
2. of low sleazy taste or quality <smarmy eroticism>
You would like for me to use it in a sentence? I'll raise you one and share a conversation as an example...
Picture it...my iPhone...20 minutes ago...I am texting with someone I met on the dating website (I know, I know...more about that here and here)...please forgive the lack of punctuation on his part and know that it pains me to type the way he wrote...
SD (smarmy dude): How are you miss
Me: Doing well. How are you?
SD: I am good are available this weekend
Me: I have my son this weekend.
SD: U going to have me some weekend soon :)
Thank you for successfully turning something about my CHILD into something sexual.
I now have the overwhelming urge to shower...ICK!!!!