To act foolish and jumble your words and actions around a totally hot and stunning girl. Instead of impressing her you most likely convey yourself as a dork.
I went to talk to K-girl with a well thought plan of attack, but made a dork of myself when I started stammering. What a mess.
Kind of like Stuttering which means to To speak with involuntary pauses or repetitions. Spammering is the internet equivalent of stuttering in which whatever you post online is repetitive, boring, and usually not making any sense.
After Jared Loughner was caught trying to assassinate CongressWoman Gabrielle Giffords, his many online rants against The Government were discovered. None of them made any sense, because they were incoherent SPAMMERINGS