Most commonly used as an interjection or an adjective but can be used as any part of speech.
Definitions include but are not limited to:
1: (adj) awesome, cool, exciting, the best thing in the world
2: (interjection) term used that is usually accompanied by successful feelings and excitement
3: (noun) explosion or strong contact (i.e. a punch)
4: (verb) to have sex
5: Bam is a unique word in that it can replace just about any word you could ever imagine
1: The babes here are soooo BAM!!
2: BAM!! That was such a tasty dinner!!
3: *BAM! BAM BAYUM BOOM BOOM BAM!!!*
4: Dude Jorge did you BAM her?!?
5: God BAMIT I hate traffic!!