mouse potato
US /ˈmaʊs pəˌteɪ.toʊ/
UK /ˈmaʊs pəˌteɪ.toʊ/
1.
a person who spends a great deal of time using a computer, especially for entertainment or browsing the internet
:
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My brother has become a real mouse potato since he got his new gaming PC.
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She spends all her free time online; she's a total mouse potato.