I keep getting a popup from lah3symzeo.com that says my flash player is out of date. Is this for real for possibly someone trolling me to download a virus?
Definitely not official Flash Player update notification. Most likely malware, adware, etc. I recommend running a complete scan on your system (virus, trojan, adware, malware, etc).
Definitely malware or some sort of. Googling the URL throws up nothing but a link to this thread here.
In addition to running a complete scan*, as maria__ suggested: check if you have any strange browser plug-ins/add-ons installed and remove these.
* Download and install Malwarebytes and run a complete scan of your computer. If the program finds any malicious files, let it remove these.