When you have walked after a long time and your fat thighs begin to rub together. rubbing+thighs= thrubbing.

To "Thrub" is to tier three subscribe to a content creator of one's choosing. A much more fun and convenient term opposed to the tradition "tier three sub". Was definitely a delicately crafted term, not a mash up of words at all.

To flirtatiously rub the belly button of a friend or potential lover for the purpose of touching them or making them laugh.

To make a terrible trade offer in fantasy football which would never be accepted by anyone in 1000 years.

The area of skin between the thumb and forefinger.