look up any word, like trill:
 
8.
Someone who does good stuff for you in the hopes that one might be suddenly endowed with all the wealth and generosity that you could possibly give (and usually are disappointed)
MAC: Dude, that guy gave you a brand-new Mini Cooper S with supercharger and NOS intake apertures?!
BILL: Man, what a suck-up, I know. He just wants me to let him date my sister. Like that'll ever happen, HA! But nice car anyway, so thanks to him!
by Ashton January 15, 2003
 
9.
Somebody who will generally do ANYTHING for another person, and they will agree to anything said by that person as well. They will never disagree nor argue no matter what. Also known as a sheep
Hey Omar, stop sucking up to Harry!
by Jimbob April 17, 2004
 
10.
A person that acts nice to a person so they will get attention and rewards.
Happens a lot on goSupermodel.com, everyone wants Admin to give them a membership, so they suck up
by fartoff June 26, 2011