Qvi nescit dissimlare nescit regnare - He who doesn't know how to lie doesn't know how to rule
Qvid novi? - What's new? 'What's up?'
Qvod cibvs est aliis, aliis est wenenum - What is food to some is poison to others. One man's meat is another poison

Qvod cito acqviritvr cito perit

[that] which is quickly acquired [is] quickly lost. Eeasy come, easy go

Qvod erat demonstrandvm - [that] which has been demonstrated - a statement of logical proof, especially in mathematics and law, abbreviated Q.E.D
Qvod vive (q.v) - Which see - a scholarly cross-reference
Radicitus, comes! - Really rad, dude!
Radix lecti - Couch potato
Radix omnium malorum est cupiditas - The love of money is the root of all evil. Avarice is the problem, money itself is not evil
Raptus regaliter - Royally screwed