Since I couldn't find anything on "SoundPlayScriptedSpeechEvent", I thought I'd go ahead and post what I found, hopefully someone will find this useful.
SoundPlayScriptedSpeechEvent(TargetPed, "JEER", 0, "large")
--Ped to speak - Speech type to play - Don't know, leave as 0 - Ped size?
--Speech types that I got to work
BYE
CALL_FOR_HELP
CHASE
CHASE_ESCAPE
CHASE_OUT_OF_BREATH
CHATTER
COMPLAIN
CONFUSED
CONGRATULATIONS
DEFEAT_TEAM
DISGUST
DONT_HIT
FIGHT
FIGHT_BEATEN
FIGHT_INITIATE
FIGHT_SACKED
FIGHT_WATCH
FIGHT_WTF
GIVE
GREET
JEER
LAUGH
PUKE
RAT_HIT
SCARED
SEE_ALLY_ATTACKED
SEE_SOMETHING_COOL
STINK_BOMB
TAUNT
THANK_YOU
THANKS_JIMMY
THIS_WAY
VICTORY_INDIVIDUAL
VICTORY_TEAM
WHINE
I'm sure there are better ways, but this is all I could find.
