Having a head of straight hair cut very short (hence bristly)(adjective)
WordNet. Princeton University. 2010.
Use "burr-headed" in a sentence
"I really had just two choices: I could get a crew cut and end up looking like a Monchichi a burr-headed, Japanese monkey doll popular in the '70s, or I could let it grow out, a style my own mother called the "space helmet.""
"The Kansas Busheviks know it's coming ... smug, bitter, burr-headed and beer bellied the bullies scream the country roads in their monster pick'em ups 4 X 4 X 44 hate radio "talk" blaring across the cornfields, warning the oldsters of Armageddeon and who are the Chosen Few to live in Heaven."
"A moment later we heard a loud curse, and we looked out from under the racks and saw a big, burr-headed boy staring at his hand with a horrified expression on his face"