Gangly is a description of physical appearance and it means someone who's tall and thin with an awkward appearance in a clumsy manner. Geeks are interested or obsessed by things like computers and comics and science fiction that they're more interested in those things than people. Louis Theroux comes across as a bit geeky probably just because of the way he looks, maybe his sort of his English accent has something to do with it i'm not sure.
Here's part 2 of this conversation with my Mum in which you can hear us wittering on about the bookshop where Mum works, some of the books she's read recently, and some of her podcast and film recommendations. Vocabulary is explained at the end, and there's a vocabulary list with definitions available.
Episode page: https://wp.me/p4IuUx-81N
italki offer: http://teacherluke.co.uk/talk
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