a hasty neologism in the form of a portmanteau. (when you make up a new word real fast by slamming other words together)
Slamagram is itself a slamagram formed from the words slam and anagram. Other examples include cankles, snobservation, jeggings, bacne, and brotatalitarian.
It is a word commonly used by students in Indian universities. It refers to the items which are used to arouse lust in a person. They can range from videos, toys, images, stories etc. which can arouse lust in a person.