As in, "I don't play sports, but I am an athletic supporter." See also Sophomoric.
Here's the visual: I'm at the Monster Jam Truck Rally (My first) and four rows down and six seats to my left is this cracker with his back to me standing up trying to get The Gravedigger's attention (from the balcony level, mind you)...clearly 'saying: "What,? WHAT?" (with the requisite DB hand gestures) hes got his 2 year old son on his shoulders, he's sporting a Cleatus-looking beard straight out of Appalachia, he's tatted-up and as skinny as a meth head...and drunk. (of course) Whereupon he slowly turns toward the rest of the balcony and reveals his deliciously-appropriate T-shirt. Priceless!
An unintended oxymoron that depends upon what level the student athlete is competing. Larger school + significant revenues = Athlete Student...or more properly, Professional Athlete.