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1.
Noun used to describe someone who you are banging, in the stage before she is your legitimate girlfriend
"Oh Hi guys, I hope you don't mind that I brought my um...friend Ursula to our poker night"
by Stan July 27, 2004
 
2.
A partner in a sexual relationship on an ambiguous standing.
"This is Kate, my, um, friend."
by lysol sammitch May 01, 2005
 
3.
a person with whom you are in a physical, but not necessarily romantic, relationship

also uhm-friend, uhmfriend, um-friend
"Oh...Hi mom, this is Steve my um...friend"
by mr.tickles July 25, 2005
 
4.
A sexual relation of dubious standing or a concealed intimate relationship.
"This is Bridget, my...um, friend."
by Zak May 03, 2003
 
5.
A member of the opposite sex who you are interested in and have been doing things with, but haven't made a move on. When introduced in public, you tend to say, "This is my um, friend ..."
"This is Jill, my ... um, friend."
by Stud April 11, 2005
 
6.
a euphemism for 'fuckbuddy'
only pussies say umfriend
girl: this is my umfriend Jake
by jolee February 17, 2009