Initials that can be used in a variety of ways, principally as an acronym for Resource Drainer. 'RD' can be used as a noun and a verb in certain contexts. You can use 'RD' to describe a person or to describe something you've done. To 'RD' from someone is to take something of theirs.
Noun: 'You are an RD, Mr. Smithers.', 'Which RD did this?'
Verb: 'I've been RDing at work today.', 'I RD'd some petrol from Texaco, didn't even pay for it.'