The word developed as the word peng can only mean a guy/girl is 10/10. But two pengtings (i.e. a squad of pengtings) can be above a 10/10. If you believe a boy/girl as beautiful as two boys/girls put together then she must be squeng.
Some people use squeng to describe other things such as food and weather
The act of pressing your buttcheeks against a pane of glass and farting. This can be done while your pants are still on, but the act is best visualized without pants -- and from the other side of the glass, for optimal viewing. For an even better visual, you may perform this act while suffering from diarrhea, but be careful to avoid the inevitable splash and collateral coverage.
You know the German Squeegee Bob butt-pressed on the bank's front window? He must have had the Hershey Squirtssomething fierce because they still haven't been able to clean it off. Seriously, it looks like someone shot a turd at the window at Mach 3!