gallop through (something)
1. Literally, to travel on horseback very quickly through some place or area. (A "gallop" is a running stride by a horse.) My horse galloped through the countryside while I clung to the reins in terror.
2. By extension, to do something hastily and, often, sloppily. I can tell you galloped through this essay—look at all these spelling errors!
galloping dandruff
slang Lice. Ugh, I'm so itchy—I really hope it's not galloping dandruff.