i Register
In some senses, promo is marked as slang, colloquial. Watch for register when choosing this word.
ADJ.
pretty
The store had a pretty promo going on with discounts on everything last weekend.
VERB + PROMO
entered, get
I entered the promo code at checkout and saved twenty dollars on my order.
PROMO + NOUN
photos
The band released promo photos of their new album cover last week.