mega
A colloquial word used as an adjective or adverb for emphasis. It means 'very big', 'huge', or is used as a positive evaluation in the sense of 'great' or 'awesome'.
Die Stimmung auf dem Konzert war mega!
The atmosphere at the concert was mega!

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A colloquial word used as an adjective or adverb for emphasis. It means 'very big', 'huge', or is used as a positive evaluation in the sense of 'great' or 'awesome'.
Die Stimmung auf dem Konzert war mega!
The atmosphere at the concert was mega!

'Mega' is a word from colloquial and youth language. It is used to express enthusiasm or emphasis, but should be avoided in formal situations such as exams or official emails.
Deine neue Frisur ist mega!
Your new hairstyle is mega!
'Mega' is invariable, so it is not declined. It can stand as an adverb before an adjective or verb, or as a standalone answer to a question.
Der Film war mega spannend.
The film was mega exciting.
As an intensifier, 'mega' can stand before almost any adjective to intensify its meaning. It works similarly to 'sehr' (very) or 'total' (totally), but is much more informal.
Ich bin mega müde, weil ich die ganze Nacht gelernt habe.
I’m mega tired because I studied all night.
super
'super' and 'mega' are both often used when you think something is very good or want to strongly emphasize something. Both words sound colloquial. 'super' is very general and fits in many everyday situations. 'mega' often feels even more casual and stronger, and sometimes a bit more youthful. They can be confused because both work as praise or as intensifiers. In neutral conversations, 'super' is usually safer, while 'mega' sounds especially enthusiastic.

Die Stimmung beim Konzert war mega.
The atmosphere at the concert was mega.
Wegen des schönen Wetters ist der Spaziergang nach der Arbeit super angenehm.
Because of the nice weather, the walk after work is super pleasant.