STRWARZ

Star Wars; those crazy Star Wars! <- in my worst Bill Murray impersonation.

GO GIRLS

Yeah! Go girls!

GRT SCOT

A fan of Doc Brown? Or someone who proudly hails from Scotland?

SCRAP 6

Another "Mangos 3"; maybe the owner does scrapbooks as a hobby?

DOODLE B

Doodle Bug?  This might have been on a VW Beetle.

MANGO 3

Seems no deciphering is needed here but the significance is obscure.

ICYRHRT

I'm going to guess it's "I see you're hurt"' maybe an emergency room doc or a paramedic? Could it be "I see your heart"?