What is cultural colonialism?

Cultural colonialism refers to internal domination by one group and its culture or ideology over others.

An example comes from the domination over the former Soviet Union by Russian language and culture. Dominant cultures make themselves the official culture; schools, the media, and public interaction reflect this. Under Soviet rule ethnic minorities had very limited self–rule in republics and regions controlled by Moscow. A common technique in cultural colonialism is to flood ethnic areas with members of the dominant ethnic group.

This is very true in the Philippines. The schools are using Tagalog (honeycoated as Filipino) for the medium of instruction. ABS-CBN and GMA are broadcasting most of the time in Tagalog. There is also an influx of Tagalog migrants to traditionally non-Tagalog areas, and these Tagalog migrants expect their new neighbors to understand their language.