tierisch
very
Colloquial for 'very' or 'enormously'; used as an intensifier.
Ich habe mich tierisch über deinen Besuch gefreut.
I was really happy about your visit.

animal / very
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very
Colloquial for 'very' or 'enormously'; used as an intensifier.
Ich habe mich tierisch über deinen Besuch gefreut.
I was really happy about your visit.

The adjective 'tierisch' (animal / very) is derived from the noun 'das Tier' (the animal). The ending '-isch' means 'in the manner of' or 'relating to'.
Das ist ein typisch tierisches Verhalten.
That is typical animal behavior.
When 'tierisch' comes as an adverb before another adjective or a verb, it usually means the colloquial 'very'. When it comes directly before a noun, it often refers to origin from animals.
Das Konzert gestern war tierisch laut.
The concert yesterday was really loud.
In colloquial speech, 'tierisch' is very often used as a synonym for 'sehr' (very) or 'enorm' (enormously) to intensify feelings or qualities. This use is informal.
Ich habe mich tierisch geärgert, als der Bus ohne mich abgefahren ist.
I got really annoyed when the bus left without me.
In the meaning 'coming from an animal', 'tierisch' is used in factual and scientific contexts, for example in biology or when describing food.
Tierisches Eiweiß ist in Fleisch, Eiern und Milch enthalten.
Animal protein is found in meat, eggs, and milk.
very
'sehr' and 'tierisch' can both be used as intensifiers. 'sehr' is neutral and fits in almost any situation. 'tierisch' colloquially means 'very' or 'enormously' and sounds casual, emotional, and more typical of spoken language. It is often used with feelings or evaluations, for example when someone is very excited or finds something very exhausting. In formal texts or polite conversations, 'sehr' is more natural. 'tierisch' also has other meanings related to animals, but in this relation the focus is on the colloquial intensifier.

Am Abend freuen wir uns tierisch auf das Konzert.
In the evening, we're really excited about the concert.
Ida ist heute sehr nervös wegen des Termins.
Ida is very nervous today because of the appointment.