Trap music is based on use of the 808 Roland drum machine, pitched and re-sampled hiphop/rap vocals, pipe flutes, gangsta synth leads, and various FX. Similar to rap without the main vocal, Trap music has been gaining lots of attention from major DJ’s and labels. Although, the style originated many years ago, Trap music has recently been making a new school comeback in many new forms such as “Trap”, “Chirp”, “SeaPunk”, “PsyTrap”, and “TrapStep”. Earliest known examples can be found by artists such as Triple Six Mafia, UGK, Swisha House, and Gucci Mane. Tempos range widely from 135-175bpm which is uncommon for most major genres of electronic dance music (EDM).

In laymen’s terms, Trap music would be best described as a recipe;

1/3 hip hop (tempo and song structure similar) – however vocals are usually pitched lower or higher
1/3 dubstep (similar drum arrangements, different builds and drops)
1/3 dub (Low frequency focus and strong emphasis on repetitiveness throughout a song)

A sub genre of music, originating from South America at around 2000, with influences from hip hop, dupstep, rap and trance music. It was named so because it was developed by rappers gathered in traps to express their problems.This music features the sound of the brass, triangle, triplet hi hats, loud kicks, snappy snares and low end 808 bass samples (mostly produced by Roland TR-808 Drum Machine) and it gives the feeling of a dark, grim and leaking background to the listener. Until 2012, this genre was exclusively based on rap and hip hop , then lots of electronic music producers, influenced by the increased EDM pupularity, added trap music in the EDM family.
There's some confusion when it comes to describing the word trap, because nowadays it is used by both rappers for their hip hop tracks and by electronic producers for their dance beats, so it describes two diffirent sub-categories of the same style .
Currently, these are the most famous categories of this style:
Hardcore Trap (heavy-bass and uneasy beats)
EDM Trap (influenced by dubstep, dirty, hot dance tracks with naughty, tough drops commonly known as "party shit"
Hip Hop Trap (Non-EDM based music, with vocals the basic element, unlike other styles, the closest thing to original)
Chill Trap(Chilly, relaxed and 'beautiful tracks, great for falling asleep, the exact opposite of the First two)
Future Trap (Music that refers to the past, illustrates the future and expresses the present)

music you listen to while selling your dope in da trap mostly southern rap, T.I., jezzy, lil webbie, bun b, etc
T.I. even named his hit album this

A genre of hip hop music that is supposed to discuss about "life in the trap". However, it completely fails at doing that. Rather than seeing trap rappers paint vivid pictures of hustling scenarios in their music (what mafioso rappers used to do), we instead see them using elementary rhymes while glorifying drug use, sex, money, and hoes. It's even worse when they try to describe street violence, because instead of using imagery to elaborate on street violence, they just say some shit like "I shot a nigga after I pulled a trigga/ Fuck these niggas, I'm a real killa" Worst of all, trap beats are the most annoying thing ever. Trap beats consist of annoying high-pitched synths with too much bass and snares that don't even sound like real snares.

Rhythmically torturous music. It’s defined by its monotonous unimaginative cadence and performed by lost children with no hope or direction.

Trap is a style of popular music that FUCKING SUCKS and is TERRIBLE. All trap "music" is just the same five TR-808 patterns with some SoundCloud rapper singing the most edgy shit he can come up with.

A type of rap music where rhyming ''nigga'' with ''nigga'' is apparently acceptable because of the ''raw and gritty'' nature of the songs.

Typical trap music verse:

"We crazy killier niggas one super nigga
Big black nigga nigga nigga nigga nigga
Sup my nigga nigga you a nigga
Me and my squad be nigga niggas"