To watch a large amount of a geeky television show, episode after episode, for a long period of time. A season of Buffy in two days, for example.
Similar to marathoning movies or chain smoking, but more geeky.
"I just mainlined the first 3 seasons of Angel"
"I'm going to go home and mainline the LOTR movies."
"Wheres Ferg at?"
"Oh, hes at home, sitting in the dark, mainlining Simpsons episodes"
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