solitary indulgence refers to a personal pleasure or gratification enjoyed alone, without the involvement or company of others. It is an activity someone engages in privately for their own enjoyment, often involving something one desires even if it might be considered an excess or an unnecessary expense.
Inmate (currently in Solitary): Yo, what up?
Guard: Shut up, or I'll put you in Solitary!
Inmate: But I'm already in Solitary!
Guard: Then I'll put you in SUPER SOLITARY!
Inmate: NO! Please, not that!
Unlike a fixed deck of cards, sock solitaire involves the added thrill of overcoming entropy and chaos to have all socks reunited in a single batch of laundry.
The person who has a team of alt accounts that she constantly uses to create pretend support, praise, and agreement "from others" for herself in forums and social media.