A Pepper Blow Job is a specific kind of blow job where the individual giving the blow job has recently eaten spicy food. If the giver has eaten a mildly spicy meal such as a Korma, it's possible for the blow job to be stimulating for the receiver without being painful. However, receiving a Pepper Blow Job immediately after the giver has consumed a very spicy meal such as a vindaloo can be extremely painful for the receiver.
"Man, I got the best Pepper Blow Job last night."
"Some girl gave me a Pepper Blow Job without telling me she'd eaten spicy food. My dick is still on fire."