def

def

1. slang A shortening of "definitely." Oh yeah, I'll def be there on Friday!
2. slang Outstanding or excellent. Whoa, those sneakers are def—I love them!

mos def

slang Most definitely. A: "You coming to the party later?" B: "Mos def, I'll see you there!"
See also: def
Farlex Dictionary of Idioms.

def

(dɛf)
1. mod. better; cool. (Originally black. From definitive.) Man, that yogurt is def!
2. mod. definitely. This is def the best there is.

mos def

mod. most definitely. Am I mad. Mos def!
See also: def
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • mos def
  • heinous
  • double buffalo
  • dudical
  • take it easy
  • take it/things easy
  • ride
  • fit for a king
  • get ahead of (oneself)
  • get ahead of oneself
References in periodicals archive
Hwang Hee Tae, South Korea def. Maxim Rakov, Kazakhstan, yusei
Hiroshi Izumi, Japan def. Parviz Sobirov, Tajikistan, ippon
Asian Games: Judo results from 15th Asian Games
Sandra Koeppen, Germany def. Karina Bryant, Britain (ippon, 1:02)
Results at judo world championships
The most distinguishing detail of the RAL/Def Jam deal with Sony is that Def Jam enjoys full profit participation in the deal.
In late 1991, Simmons' teamed with Hollywood producers Bernie Brillstein and Brad Grey (whose credits include the two Ghostbuster films and Wayne's World) to produce Russell Simmons' Def Comedy Jam, a series of eight half-hour comedy specials for HBO.
Russell Simmons' rush for profits
Heather Watson def. Agnieszka Radwanska (7), 6-4, 6-4; Elina Svitolina (23) def.
BC-TEN--Indian Wells Results,Writethru
Ana Ivanovic (5) def. Yulia Putintseva, 6-3, 6-1; Sara Errani (11) def.
BC-TEN--Indian Wells Results,Writethru
Agnieszka Radwanska (7) def. Alison Riske, 6-3, 6-1.; Ekaterina Makarova (8) def.
BC-TEN--Indian Wells Results,Writethru
Lin Zhu def. Francesca Schiavone, 0-6, 6-3, 6-3; Yanina Wickmayer def.
Caroline Garcia, and Katarina Srebotnik (7) def. Ana Ivanovic, and Angelique Kerber, 6-4, 6-4; Klaudia Jans-Ignacik, and Andreja Klepac def.
BC-TEN--Indian Wells Results,Writethru
 Venus Williams (7) def. Barbora Zahlavova Strycova, 7-5, 3-6, 7-6 (5).
BC-TEN--Doha Results
Maria Sharapova (1) def. Shelby Rogers, 6-4, 6-1; Bethanie Mattek-Sands def.
BC-TEN--Doha Results
Treat Huey, and Scott Lipsky def. Ryan Harrison, and Austin Krajicek, 4-6, 6-4, 10-4.; Ivan Dodig, and Max Mirnyi (1) def.
BC-TEN--Rotterdam Results
 Kenny de Schepper def. Marsel Ilhan, 6-4, 3-6, 6-3.; Edouard Roger-Vasselin def.
BC-TEN--Montpellier Results
Simone Bolelli and Fabio Fognini def. Jean-Julien Rojer, and Horia Tecau (6), 6-4, 3-6, 6-3; Pierre-Hugues Herbert and Nicolas Mahut def.
BC-TEN--Australian Open Results,Writethru