Derived from "manspread", meaning an elderly person (ie a GRANdpa or GRANdma) who is obnoxiously indifferent to how others feel about their behavior in public.
Man, this lady I sat next to at the movies was using her giant smartphone throughout the previews. When I told her the glare was a bit intense and asked her to put it away she said with out a hint of irony "I will", and kept using it for 5 more minutes. Then, throughout the movie she chewed gum loudly and farted at least twice. Talk about granspreading!
by figment20 March 06, 2016