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When you stick your thumb in a girls butt during sex. You've gotta love it like it's your last.
Person 1: Yooo how was your night?? Did that girl sleep over?
Person 2: Ya lmao I thumb butted I think I love her.
To retroactively "like" or "thumb" a large amount of a persons facebook posts and/or pictures.
That new guy I met is such a facebook stalker. He's been thumb bombing my page for the last week.
the act of placing pressure of one's thumb on their partner's asshole.
"Last night Richard put his thumb on deck."
Shark Thumb.
The sexual act of placing you little finger (pinky) inside your partners anus (butt), while keeping all other fingers tucked in except the thumb that will stand proud and looks like a shark fin just slightly cresting the bottom of your partners posterior (butt) as they lay on their front.
During foreplay Sam Shark Thumb'ed meredith last night, meredith giggled as she looked over her shoulder and saw the shark fin (Sam's thumb).
While having Doggystyle sex with your significant other you place your thumb in her asshole. There for placing "The Thumb in the Plum."
Jill was riding my ass all day about the chores I hadn't gotten to yet, so when we had sex later that night I put "The thumb in the plum."